为下列句子排序，使之组成一段完整的对话。

A. OK. Can I try them on?

B. Yes. I'm looking for a whiteT-shirt.
C. Can I help you, sir?

D. You're taller than me. I thinksize XL fits (适合) you well.

E. Size L.

F. Of course. Here you are.

G. What size do you want,please? 

C→→→→→ → F