Shop Assistant:Can I help you?
Shop Assistant:我能帮你吗？

Customer:Yes, I’m looking for a pair of trousers.
Customer:我想买一条裤子。

Shop Assistant:What size are you?
Shop Assistant:你穿多大号？

Customer:I’m a large.
Customer:我穿大号。

Shop Assistant:Ok, try these on in the changing rooms.
Shop Assistant:那你去试衣间试试这条裤子吧。

Customer:Thanks.
Customer:谢谢。