if you do change the dates in advance, you shouldn't have any issues.
be careful and do the dropped dates before you check in.
you have to cancel 6 days out or you will lose your deposit for the room, or if you check out early and not have your days dropped in advance
from the website:
Cancellation Policy
Penalties:
Days Prior to Stay:
6 days or more: Full refund
0- 5 days prior: charged one night's room rate plus tax
PLEASE NOTE: Deposits are forfeited if guest checks out of the hotel prior to the check-out date.