I want to extend my stay, but the hotel is fully booked.

Does the subject want to ask "I want to stay, but what should I do if the hotel is fully booked?" Contact the front desk of the hotel and wait for the vacancy.

1. Contact the front desk of the hotel: You can contact the front desk of the hotel directly and ask if there are any vacancies or if you can keep one. If the hotel has vacancies or can keep them, you can continue to stay in the hotel.

2. Waiting for a vacant room: If the hotel is full, but you only need to stay for one more night or several nights, you can ask the hotel front desk if there are any guests who are about to check out, and wait until the room is vacant before continuing to check in.