Yes and yes. When you book on-line you choose what you want and if it's available it shows that and if not not you choose something else. Then once you find what you want, you lock it in for 20 minutes while you proceed to allocate your points for the trip, designate persons in the room, etc. and then you get to a final screen where you verify you want the trip at which time you actually complete the reservation, or can choose to start over.