A: Pardon me. Could you help me?
打扰下，你能帮我下吗？

B: Of course. How can I help you?
当然可以。你需要什么？

A: I am looking for a sweater.
我在挑毛衣。

B: What size do you wear?
你装什么尺寸？

A: Medium, I think.
中号，我想。

B: Here. How do you like this one?
给你，你喜欢这件衣服吗？

A: It's pretty. Can I try it on?
很漂亮，我能试试吗？

B: You can try it on in the fitting room over there.
你可以去那边的试衣间试穿。