Actor Initiated by User Communicates with FlightInfoServers Entry Condition 1. System contacts the relevant airline to check whether the fares have changed since the User made the reservation. System presents User with a summary of the reserved flight and the current price. User selects the purchase now option. System retrives User's credit card information and sends that to the airline along with the desired flight information.
System waits for confirmation from airline.
Exit Condition 7. Actor Initiated by User Communicates with ClientDatabase Entry Condition 1. System displays the preference modification screen to the User Flow of Events 2. System stores the User's data in the ClientDatabase. Exit Condition 4.