Hi all, I am planning a trip in a couple of weeks to a St. Regis hotel. I originally booked early for 2 nights and got a good rate. I now need to extend it to 3 nights, but obviously the rate has increased, so if I extend, the new, higher rate will apply to all 3 nights, not just the last one.

Is there any issue with leaving my existing booking, and booking the same room category for one night at the higher rate? Is this something that hotels don't like, or is it a normal thing?

Also, on another booking I have, I booked for 5 nights, but now want to shorten it to 4 nights. So, for example, I booked 1st - 6th, I now want to change to 1st to 5th. Unfortunately the hotel is sold out at that time, so it shows as sold out, even though I would just be extending my existing booking. Is the only option here to roll the dice and cancel, hoping that the room will be available to rebook?