Cancelled my reservation two hours before check in. All other places were booked to capacity. I'd received a good rate when I made the reservation, I think they realized the parking shortage during the time I needed and cancelled so they could sell the space to someone else for more money. Luckily I had a friend who lives near a BART station so I was able to leave my car with her and take BART to the airport otherwise I'd have been in a really bad spot and may have missed my plane.