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Given a travel related situation, and given a specific question about the situation, summarize the question into a title

I am looking to book 2 nights at the Hilton Milwaukee City Center - checking in Saturday July 27 and checking out Monday July 29.

When I try to book a 2 Double Bed room with the Advance Purchase option, it tells me that the night of July 27th will cost $212, and the night of July 28th will cost $183.

Out of curiosity, I changed the search for just one night - July 28th. The Advance Purchase option tells me a 2 Double Bed room will cost only $122.

(I also tried a search for just the night of July 27th, but oddly it says no rooms are available. Why don't they want to make the room available to people who just want to book Saturday night?)

Why is it that a room on a particular date for a one-night stay costs a certain price, but when part of a multi-night stay it costs significantly more?

Output:
Why would a hotel charge a higher rate when booking more than one night?