Airline Reservation System contains the details about flight schedules, passenger reservations and ticket records. The system enables the customer to search and display for airline flights on a specified date, choose a flight based on the details, reservation of flight and cancellation of reservation. Flight schedules should have flight number, flight date and time (which is consist of day, month, and year and so on for time), Departure city and Arrival city the number of seats for each class and price. After search the system display list of available flights and allows customer to choose a particular flight. Then the system checks for the availability of seats for a particular class on the flight. If the seats are available then the system allows the passenger to book a seat. Otherwise it asks the user to choose another flight. To book a flight the system asks the customer to enter his details such as name, address, city, state, and contact number. The system also allows the customer to cancel his/her reservation, if any problem occurs. Ticket records should be issued after booking the flight, it has flight information along with passenger information in addition to seat class category which can be (First, Business or Economy class).

use the concepts of CS111 in your solving: (Inheritance, Polymorphism, Abstract classes, Interface, Composition, ArrayList, Array

Help me with the UML/class diagram guys, dont know where to start exactly