Introduction - If you have any usage issues, please Google them yourself
		 
a flight booking system 
 * 1. Firstly, choose 1 to activate a plane ,otherwise you can not do any operations
 * 2. According to the document, Scotia Airlines only has two flights
 * 3. Choose 2 to change flight state(ps. previous state would not display for choosing)
 * 4. Choose 3 to implement reservation, booking and cancellation features
 * 5. Choose 4 to view all seating information
 * 6. Choose 5 to view information on a particular seat
 * 7. Choose 0 to quit.