如何用英语查询酒店已经预订好了

i have a reservation in your hotel, my name is XX
i will arrival on May 12 ,twin beds room, can you give me the confimation number?

Could you please comfirm a reservation by the name of 姓名 on 日期

I'm calling to confirm my reservation for May 12（ 几月几日）

The reservation was for a double(/single双人间/单人间) room for two days(几天).