I have run into consistency issues on booking where it'd show you a room and then say it's not available when you try to book. Go back, refresh, there's a room,

I have run into consistency issues on booking where it'd show you a room and then say it's not available when you try to book. Go back, refresh, there's a room, book -> error again. But to answer your question, it's probably more about hotels advertising truthful number of rooms than booking's system, and I believe booking makes sure hotels don't overbook by penalizing them.