5. If there are no rooms available, please inform me as I must look for another hotel.
如果没有空房，请尽快告知我以便另寻旅馆。
还能这样说：
Please tell me to book another room if there is no vacant room.
If the room is not available, remind me to book in another hotel.
应用解析：
make oneself available 使自己可以效劳;
available to 对……可获得的;
make sth. available 使某事可利用
6. How long will you reserve the room?
你预定多长时间?
还能这样说：
How long do you intend to book the room?
How many days will you book the room?
应用解析：
slip out of a room 溜出房间;
storm into sb.'s room 闯入某人的房间;
sweep out of the room 大模大样地走出房间
7. What's the price of the single room?
单人房需要多少钱?
还能这样说：
How much does it cost for the single room?
How much should I pay for the single room?
谚语：
Every man has his price.
每一个人都有其价码。
8. What services come with the rate?
价格里包括哪些服务?
还能这样说：
What services are included in the price?
What services does it involve?