I needed to book a room at the last minute at a local Hyatt Place this weekend- zero availability and none popped up throughout the day. Another Hyatt Regency that is 50 miles further did have some open up later on in the afternoon, which made me wonder whether room availability on hyatt.com is fluid. I tweeted @hyattconcierge asking whether they have a way of "notifying" me if an inventory opens up later on in the day. Here's the reply: "no, most of our hotels no longer have a waiting list. You would just have to keep calling back to see if there's avail." I know as a diamond, I would be guaranteed a room if it was booked less than 48 hours prior to arrival. I personally think it would be a valuable benefit if Hyatt would let us diamonds be put on a "waitlist" at a sold out property and be notified should a room becomes available. I try to stay at a Hyatt property whenever possible- and I had to just suck it up and stay at a Holiday Inn next door.