I'm going to Shanghai early tomorrow morning. I would like to request an early morning call. 我明天一早要去上海。我想要求叫醒服务。

Yes, Mr. Wang, at what time would you like us to call you tomorrow morning? 好的，王先生，您希望我们何时叫醒您呢?

I wonder if your hotel has the morning call service. 你们宾馆有唤醒服务吗?

I'll have a 6 o'clock morning call. 我要一个早上6点的叫醒电话。