Airline reservatoin system

I m asked to perform bookin through credit system.i am done with basic things like login,signup ,flight details.but i dont to proceed after this i.e once booking is done by the passenger,his name should go to the flight database...pls help me out guys in preparing the reservation module....here i m posting the code that i ve done so far...

/
import java.io.*;
public class Passenger
{
    // instance variables - replace the example below with your own
    public String Pname;
    public String MailId;
    public String Address;
    public String username;
    public String pwd;

    

    /**
     * Constructor for objects of class Passenger
     */
    public Passenger(String Pname,String MailId,String Address,String username,String pwd)
    {
        // initialise instance variables
        this.Pname = Pname;
        this.MailId = MailId;
        this.Address = Address;
        this.username = username;
        this.pwd = pwd;
       
        
    }
}
    
         
class sample
{
    public static void main(String a[])
    {
        
        Passenger p1 = new Passenger("Vignesh","abcd@yahoo.in","11/5 parthasarathy puram","vicky","xyz123");
        Passenger p2 = new Passenger("Ramesh","efgh@yahoo.in","22/5 parthasarathy puram","rams","fast");
        Passenger p3 = new Passenger("Dinesh","ijkl@yahoo.in","33/5 parthasarathy puram","dinu","pwd12");
        Passenger p4 = new Passenger("Rahul","mnop@yahoo.in","44/5 parthasarathy puram","rahulcool","007bond");
        Passenger p5 = new Passenger("Saravana","ghij@yahoo.in","55/5 parthasarathy puram","sarah","sarav");
        int point=0;
        String usernm[] = {"Vignesh","Rahul","Dinesh","Saravana","Ramesh"};
        int size=usernm.length;
        int points[]={2000,3000,4500,6000,10000};
        int size1=points.length;
        for(int i=0;i<5;i++)
        {
          if(p1.Pname==usernm[i])
          {
            System.out.println("User" + "\t" +usernm[i]+ "\t" +"is having"+"\t" +points[i]); 
          }
        }     
          
        for(int i=0;i<5;i++)
        { 
          if(p2.Pname==usernm[i])
          {
      
             //point =points[i];
             System.out.println("User"+"\t" +usernm[i]+"\t"+ "is having"+"\t" +points[i]); 
         }
        }      
         
         
        for(int i=0;i<5;i++){
          if(p3.Pname==usernm[i])
          {
           
          // point =points[i];
           System.out.println("User"+"\t" +usernm[i]+"\t"+ "is having"+"\t" +points[i]); 
         }
        }
           
  
        for(int i=0;i<5;i++)
        {
          if(p4.Pname==usernm[i])
          {
          
          // point =points[i];
           System.out.println("User"+"\t" +usernm[i]+"\t"+"is having"+"\t" +points[i]); 
          }
        }
          for(int i=0;i<5;i++)
        {
          if(p5.Pname==usernm[i])
          {
          
          // point =points[i];
           System.out.println("User"+"\t" +usernm[i]+"\t"+"is having"+"\t" +points[i]); 
         }
        }
        Flight f =new Flight();
        f.display();
        Booking b = new Booking();
        b.reservation();
        

    }
      
    }


class Flight
{
  int FlightNumber[]={1,2,3,4};
  String Source[]= {"India","China","India","London"};
  String Destination[]= {"U.S","India","U.K","U.S"};
  String DepartureTime[]= {"3.00A.M","11.00P.M","11.30P.M","7.00P.M"};
  String ArrivalTime[]= {"1.00P.M","3.00A.M","2.30A.M","4.00A.M"};
  int Miles[]={8000,9000,8500,10000};
  int Seats[]={15,20,25,20};
  
  void display()
  {
    for(int i=0;i<4;i++)
    {
      System.out.print(""+FlightNumber[i]+"\t"+Source[i]+"\t"+Destination[i]+"\t"+DepartureTime[i]+"\t"+ArrivalTime[i]+"\t"+Miles[i]+"\t"+Seats[i]+"\n");
            
    }
       }
}

  
  
  class Booking extends Flight
  {
    int distance = 0;
    double cost = 0.0;
    int choice;
    Flight f = new Flight();
    
    void reservation()
    {          
    System.out.println("Select your choice");
    System.out.println("1-----> India -U .S");
    System.out.println("2-----> China - India");
    System.out.println("3-----> India - U .K");
    System.out.println("4-----> London - U .S");
   
    try
    {
       BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
       int choice = Integer.parseInt(br.readLine());
      switch(choice)
      {
        case 1:
        { 
          for(int i=0;i<4;i++)
          {
          if(f.Source[i]== "India" && f.Destination[i]== "U.S")
          {
            distance = Miles[i];
            cost =(0.1*distance) + distance;
            System.out.println("Trip cost = " + cost);
            System.out.println("Available seats = "+Seats[i]);
            System.out.flush();
            System.out.println("Nmber of seats required:" );
            int sno = Integer.parseInt(br.readLine());
            System.out.println("Available seats:"+(Seats[i] - sno));
                                             
                        
          }
          }
          break;
        }
        
        case 2:
        { 
          for(int i=0;i<4;i++)
          {
          if(f.Source[i]== "China" && f.Destination[i]== "India")
          {
           distance = Miles[i];
           cost =(0.1*distance) + distance;
            System.out.println("Trip cost = " + cost);
            System.out.println("Available seats = "+Seats[i]);
            System.out.flush();
            System.out.println("Nmber of seats required:" );
            int sno = Integer.parseInt(br.readLine());
            System.out.println("Available seats:"+(Seats[i] - sno));
                                             
          }
          }
          break;
        }
    
        case 3:
        { for(int i=0;i<4;i++)
      {
          if(f.Source[i]== "India" && f.Destination[i]== "U.K")
          {
            distance = Miles[i];
            cost =(0.1*distance) + distance;
            System.out.println("Trip cost = " + cost);
           System.out.println("Available seats = "+Seats[i]);
           System.out.flush();
            System.out.println("Nmber of seats required:" );
            int sno = Integer.parseInt(br.readLine());
            System.out.println("Available seats:"+(Seats[i] - sno));
                                             
          }
        } 
        break;
        }
        
        case 4:
        { 
          for(int i=0;i<4;i++)
          {
            if(f.Source[i]== "London" && f.Destination[i]== "U.S")
          {
             distance = Miles[i];
             cost =(0.1*distance) + distance;
            System.out.println("Trip cost = " + cost);
            System.out.println("Available seats = "+Seats[i]);
            System.out.flush();
            System.out.println("Nmber of seats required:" );
            int sno = Integer.parseInt(br.readLine());
            System.out.println("Available seats:"+(Seats[i] - sno));
                                             
          }
        }
          break;
      }
      }}
          
         catch(Exception e)
         {
           
           System.out.println("I/O Error");
         }
    }

  }