One of the BIGGEST problems with reservation system is the scalpers who buy up all the reservations, then sell them on craigslist for a mark up. For this reason, most, if not all reservation systems require the ID of the camper signing in matches the name on the reservation, and why reservations made in one name can not be transferred to someone else later. Before this was implemented, it was almost impossible to get a reservation to camp in Yosemite.
My bet is that you won't be able to do much more than cancel.
