What if a guest booked a room online, but gave it to another guest because he didn't arrive for a long time?

If the guest's online reservation is arranged by the hotel for other guests because it has not arrived for a long time, the hotel should contact the guest as soon as possible and explain the situation. The hotel can apologize to the guests and suggest them to arrange other accommodation or help them to re-book the same room. If a guest asks to stay in a room, the hotel can try to negotiate with the guest who booked the room before to meet the guest's requirements as much as possible. If negotiation fails, the hotel should provide guests with free room upgrade, late check-out and other compensation measures to make up for the inconvenience. In a word, hotels should try their best to help their guests and keep their satisfaction and trust.