il main
 System.out.println("Find Booking");

                 	 System.out.println("Insert Booking ID: ");
                        String idToSearch = myInput.nextLine();
                        Booking bookingFound = BookingManager.retrieveBooking(idToSearch);

                        System.out.println(bookingFound.toString());

                    break;

il bookingmanager

public static Map<String, Booking> bookingsManager = new HashMap<> ();

    public static void createBooking(Booking b){
         bookingsManager.put(b.getBookingID(), b);
         bookingsManager.put ("ID1", new Booking ("B001","Car", "20/04/2014", "21/04/2014", 1, 50, "CBP123"));
         bookingsManager.put ("ID2", new Booking ("B002","Cycle", "01/04/2014", "03/04/2014", 2, 2, "GHF147"));

    }

    public static Booking retrieveBooking(String id){
        return bookingsManager.get(id);
    }

u Booking

 public String getBookingID(){
            return bookingId;
        }