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收银员:
Good evening， sir. May I help? 
早上好，先生！有什么可以为您效劳的吗？
客人:
I’d like to change some US dollars into RMB. What is the exchange rate today?
我想用美元换些人民币。请问今天的兑换率是多少？
收银员:
That is one dollar to 7.29 RMB.
1美元换7.29人民币。
客人:
OK， I see. I’ll change one hundred and here is the money.
好，我换100美元，给你钱。
收银员:
Alright.
好的。