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.____
