Booking class updated visuals and added some error proofing 

Flight class just updated visuals to work with new output of flight
class
Merge branch 'master' of git@github.com:COMP-3350-Group-6/Project.git
Merge branch 'master' of git@github.com:COMP-3350-Group-6/Project.git
-Added Payment Section to the Booking Screen.

-Flight screen updated the size of the window and the size of the List
that is showing the list of searched Flights