S: Shop assistent(店员)
T: Tom
S:Can I help you ?
T:Yes,plese. I want a T-shirt.
S:What color do you want?
T:Blue.
S:Here you are.
T:It's nice.I'll take it
S:How much is it?
T:50 yuan.
S:I'll take it.
T:Thank you!
S:You are welcome!
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