The current rates are on the notice board, sir.  先生，汇率都表示在告示牌。

I want to change some US dollars into euros.  我想要把一些美金换成欧元。

I would like to exchange my RMB for 500 US dollars. 我想要用人民币兑换500美元。

How much would you like to change? 钱想要怎么兑换？

Small change, please. 麻烦帮我换成小钞。

What is the service charge? 服务费是多少？

How much is a commission? 手续费是多少？

We charge a 1 dollar commission on each deal. 我们每笔交易会收1美元的手续费。

Would you please sign your name at the place marked with “”? 请在引号的地方签名好吗？

What are your banking hours? 请问你的营业时间是几点？