将下列句子排序，组成一段完整的对话。

A. Yes,please.1 want a hat.

B. Thirty dollars.

C. What color do you want?

D. How much is it?

E. You're welcome.

F. Can I help you?

G. Black and white.

H. I'll take it. Thank you.

I. Here you are.

正确顺序是: __________________________