As I recall, when Sun was all big on hot-desking at one point, you could reserve a space but I don't know if you reserved a specific location or just a desk generically. I suspect though that if had a program like this and were near capacity, you'd almost certainly want to reserve specific locations; otherwise people will end up wandering the office looking for a space.

However, TBH I don't find this an issue. I'm often at various company locations and I can always find a space to plop myself down and work on my laptop whether it's some sort of enclave or just the cafeteria.