All my bags are checked in. I guess I'm all set to go.

我的行李都检查完了，看来我可以走了。

I'm relieved to hear that.

你的话使我松了一口气。

May I help you, sir?

需要我帮忙吗，先生？

Would you mind opening your suitcase?

请把您的箱子打开，好吗？

Sure. Can you give me fifty dollars in small bills, please, and ten dollars in change?

好的。你可以帮我把50块钱换成小钞，10块换成零钱吗？

Is it all right if I use my credit card?

如果我使用信用卡行吗？