Hang on, please.

请等一下。

I really must be going now.

现在我真的该告辞了。

Excuse me. Could you give me change for a dollar?

劳驾，你能不能换1元零钱给我？

By all means.

当然，一定。

Yes. And please ask me the next time you want to use something.

是的。另外，如果下次要用什么东西，请先问我一声。

No. It's only a five-minute walk.

不远，只要走5分钟。