TK Airlines runs regular flights between Ankara and 9 other cities in Turkey. There are several daily numbered flights on regular schedule. The reservation system keeps track of passengers who will be flying in specific seats on various flights, as well as people who will form the crew. For the crew, the system needs to track what everyone does, and who supervises whom. There are three kinds of employees in the organization, pilots, hosts and ground personnel. Only the ground personnel directly uses the reservation system, which runs as separate module. Other types of employees uses the TK Flight Managements system as the other passengers if they would like to travel. TK Airlines personnel sometimes fly as passengers in scheduled flights. For their reservations, the system only requests their personnel id number. Their other info is already exists in the system. They are given points for each flight that they participate as a crew. Then during their reservation, they may use these points against their purchases. Besides, there is a regular 50% discount for airlines personnel and their families. There is also a frequent-flier program which shows flight points to frequent passengers and they may use their points during reservation. The system administrator is the one who creates flights, and/or modifies, cancels existing ones, including the crew of each flight. The administrator can also display several types of reports, can send messages to crew of a particular light. The passengers, as usual, can search for a particular flight, book or buy ticket on particular flight; can cancel or update their bookings or tickets if bought. They can also buy tickets for their bookings. Online check-in, checkout, meal order are planned to be available in the future releases of TK Flight Management System. 1. (15 pts) Design fully-dressed USE CASE diagram for TK Flight Management System. Clearly state any "include", "extends" relations if exists. 2. (15 pts) Write a use case description for "buy ticket" use case. You should consider all alternative flows