This happened to a friend of mine abroad. She and her husband made reservations to a supposedly famous hotel three months before they flew for their anniversary vacation. She told me that upon arriving, they were welcomed warmly which looked that everything was alright. When their reservation was being looked up, the staff got confused because of the mixed up dates of reservation. They did arrive on the day they were supposed to but someone already occupied the room they wanted. Of course the hotel manager was very sorry and offered them a refund instead. They could not be taken in since the hotel was fully booked. Fortunately, the couple ended up somewhere nicer.