第一句：I'm checking out.

我要退房。

A: I'm Mr. Li. Room 1024. I'm checking out. Will you make out my bill, please?

我是1024房间的李先生。我要退房。能把我的账单准备好吗?

B: Yes. We'll have your statement ready in a few minutes.

好的。我们将马上为您准备好账单。

第二句：Could you please explain this for me?

您能为我解释一下这个吗?

A: I'd like to have a look. Could you please explain this for me?

我想看一下。你能为我解释一下这个吗?

B: They are a few small bills from the bar.

它们是酒吧的几张小单子。

知识点延伸：

the cashier's desk 指的是结账处，cashier指的是出纳员，statement指的是结账单，如果游客对账单有异议的话，可以让出纳员核查一下，这时可以说：

Could you please go through it one by one?

你能一个一个核查一遍吗?