Well... I personally would ask them!
Did you already do the cash thing? If it's credit you may be able to cancel as we speak?!
Can't hurt to ask, request, or even cancel.
Ya best find someone your comfortable with. Take a bit of time and go door to door if ya have time to. OR... do a "search" on the board and request from there.
Anywho.... HAVE A GREAT TRIP!