Here are some suggestions on how to look or get an appointment for unique items.
    Non-Functional requirements related to the flight system can be stated as follows.


1. GUI must be able to provide. 
 2. This software must be running on Windows XP. 
 3. Must be able to use existing hardware and software. 
 4. Must have an internet interface. 
 5. Payment protection should be provided. 
 6. Reservations should be made within five minutes. 
 7. Facilities should be provided for public use.