grab a C tutorial like this one:
http://en.wikibooks.org/wiki/C
start with a 'Hello World' application, then move into some user interfacing and take it from there
complex programs are just that: complex. it takes time to write them, and you can't ask other people to do them for you. BUT if I was going to do this assignment, I'd start with a menu, and then you have functions that yo ucan call from the menu to take actions associated with your bank or movie reservations.
good luck!