第一句：I'd like to reserve a room.

　　我想预定一个房间。

　　A: Good morning, Room reservations. May I help you?

　　早上好，房间预定处。需要什么帮助？

　　B: I'd like to reserve a room.

　　我想预定一个房间。

　　A: For what date?

　　您订哪天的？

　　B: From June 7th to June 20th, please.

　　从6月7号到6月20号。

　　第二句：Is there a room available tonight?

　　今晚有空房吗？

　　A: Good morning. Is there room available tonight in your hotel?

　　早上好！贵宾馆今晚有空房间吗？

　　B: What kind of room do you want?

　　您想要什么样的房间？

　　A: I'd like a double room, please.

　　我想要双人间。

　　B: Oh, sorry. I'm afraid they are fully booked.

　　哦，抱歉。恐怕都已被预定了。

　　A: Thanks anyway.

　　不管怎样，还是谢谢你。

　　预定旅馆的类似表达法还有：

　　I'd like to book a single room for six days.

　　我想订一个单间，为期六天。

　　Can I reserve a double room on the night of May 2nd?

　　我可以预定5月2号晚上的一个双人间吗？

　　Will you have free rooms for tomorrow evening?

　　明晚有空房吗？

　　Do you have any vacancies tonight?

　　今晚有空房吗？