A: Can I help you?
B: Yes. I would like a pair of shoes.
A: Any particular color? 
B: Red. 
A: You should have this one. It's a pair of sports shoes made of leather.
B: let me try them on... En...Do you have larger ones?
A: Yes. Here you are.
B: Well, good. I'll take them. How much?
A: 200 yuan.
B: Here's the money. Thank you.
A: Thank you. Bye
B: Goodbye.

A: May I help you?
C: I’m looking for a sweater.
A: How do you like this one?
C: Can I have a look at that one?
A: Sure.
C: Do you have this one larger?
A: What size do you want?
C: Large.
A: You should have a try this one. Here you are.
C: It’s very nice. I’ll take it. Would you give me some discount?
A:Yes, sir. I can give you a small discount. 
C:Ok.