Listen to the whole passage
Listen to the whole passage once first, then practice sentence by sentence.
The first line is the other person opening the conversation; the "You" lines are suggestions for you to practice saying in this scenario (not a back-and-forth dialogue).
A bank teller
你好，请问你要做什么？
Hello, may I ask what you'd like to do?
You
你好，我想换钱。
Hello, I'd like to change some money.
You
请问，我能在这儿换钱吗？
Excuse me, can I change money here?
You
我有一些钱想换。
I have some money I'd like to change.
You
我想换这一百块钱。
I'd like to change this one hundred yuan.
You
好的，我知道了。
Alright, I understand.
You
谢谢你，再见！
Thank you, goodbye!