If you are late or card insufficient
Not there on time or you showed on wrong date Hotel specialist told me about this
Not sure. I've never had a room cancelled before.probably showed up late and they gave your room away
IF running late I call ahead of time to let them KNOW I AM on my way. NEVER had a cancellation and I believe a courtesy call saved my room.
They Can't
Only thing I can think of is your reservation is not guaranteed and you arrived after 6pm(I think).
Not sure because we never experienced that before
Don't know because, never stayed.
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