第一句：I‘d like to order my breakfast.

我想预定早餐。

A: Good morning. I'd like to order my breakfast.

早上好，我想预定早餐。

B: All right, sir. What will you have?

好的，先生，您要什么?

A: Buttered toast, fresh ham and a cup of black tea.

奶油吐司，鲜火腿和一杯红茶。

B: Wait a moment, please.

请稍等。

Please bring my breakfast at seven o'clock.

请在早上七点送早餐过来。

A: Room service, please.

客房服务部。

B: Is there anything I can do for you?

能为你做什么吗?

A: Please bring my breakfast at seven o'clock.

请在早上七点送早餐过来。

B: All right. I'm glad at your service.

好的，乐意效劳。

向客房服务部说明在房间用餐或是订餐的相关表达还有：

I'd like to have my breakfast in the room.

我想在我的房间用早餐。

breakfast 早餐，lunch 午餐，supper 晚餐，dinner 也指晚餐，但dinner一般指较正式的、丰富的晚餐。