星级典句：
第一句：I'd like to return this.
我想退货。
A: I'd like to return this.
我想退货。
B: What's wrong with it?
有什么问题吗？
A: It's too large for me.
我穿太大了。
B: Would you like to exchange for a smaller size?
给您换件小一点的好吗？
A: I'm afraid there is none in my size for this color.
恐怕这种颜色没我的尺寸。
B: Then I'll do the refund for you.
那我就给你你退钱。

第二句：I'd like to exchange this.
我想要换这个东西
A: Excuse me, I'd like to exchange this blouse.
对不起，我想换这件衬衫。
B: What's the reason?
什么原因？
A: It's the wrong size.
尺寸不对。
B: Do you have the receipt?
你有收据吗？
A: Yes, I have.
是的，我有。

其他表达法：
I'd like to get a refund on this.
我想退货。
May I have a refund on this, plaease?
请给我退了这个好吗？
May I have any money back?
可以给我退钱吗？
Can I ask for a refund?
可以给我退款吗？