Explain the THREE (3) types of flow of events in use case specification and give ONE (1) example for each flow based on the following segment of requirement specification.

(6 marks)

Function : Booking Flight The flight details that includes the originating flight terminal and destination terminal along with stops in between, number of seats booked or available seats between two destinations. View the available flight source based on the selected date and destination terminal. Insert the customer description including customer code, name, address and phone number. Message Incomplete form error will be displayed if the flight details and customer details are not completely inserted. Cancel the transaction of booking flight from any source to any destination.