我想请贵公司帮我预定一个房间，怎么翻译？

Kindly please book a room for me.
或者
It will be quiet appreciated if you could make a reservation（book a room ） for me at the 某某Hotel。
第一句比较直接。
第二句非常礼貌，可以理解为：如果贵司能在某某酒店为我预定一个房间，我将非常感激。

I would like to ask you to book/reserve a room for me please.

please help me to book a room.