That's OK.

没关系。

You've done me a great favour.

您帮了我大忙。

Then you'll need small change.

那你需要换小零钱。

Yes, indeed.

是的，确实如此。

I wish you wouldn't play the TV so loud.

希望你不要把电视机开得这么响。

You have to be there half an hour before departure time.

你要在起飞前半小时到那里。