Originally Posted by
Jon Maiman
Perhaps they used an annual free night certificate from the credit card. Regardless if it is already in your account you should be fine. One other thought, if you guaranteed the reservation to the card you're planning on cancelling, you're most likely still okay. To be safe you could call in and update the card used to guarantee your reservation.
--Jon
I believe this is correct and the OP should be okay. If they need to update the card the reservation is held with they can call in as you said, or simply add the new card to their profile and edit the reservation online.