根据对话内容，补全对话

A: What can I do for you?

B：I want to buy a pair of shoes.

A:

B: Size eight or nine.

A: Ok! How about this pair?

B: Sorry, I do not like black.

A: Yes. We have blue, white and brown ones .

B: Can I havea look at the brown ones?

A: Yes, please.

B:

A: Forty-sixyuan.        

B: It is too expensive.

A: How about forty?    

B: It is still expensive. What about thirty-five?

A: All right.

B: OK.