The group-buying hotel calls in advance to make a reservation, but he always says what to do if it is full.

If you buy a hotel group purchase, the other party will return the group purchase after the answer is full and you can't book it, and then find another hotel to buy it. Group buying hotels should pay attention to the following points: first, before buying a hotel, you should call the other party and ask if there is a room available for you at the time you want to book. If it is full, give up decisively. Second, check carefully whether the hotel has a time limit or needs to make a reservation before buying a group. Some hotels have time constraints, for example, you can't stay at night, you can only book an hourly room, or if you need to make a reservation, you should check whether you can make a reservation at the time you want to check in, instead of going directly to the hotel to check in after the group purchase.