这是你的咖啡
Here is your coffee
这是谁的咖啡?
Whose coffee is this?
请问是谁点的咖啡?
May I ask who ordered this coffee?
这是你要的咖啡吗?
Is this the coffee you wanted?
这是你点的咖啡吗?
Is this the coffee you ordered?
从这边的楼梯上去就到了.
Go up the stairs here and you'll get there.
慢走,欢迎下次再来!
Goodbye and please come again!
都是比较口语化的英语,：）