I'd like to return this. 我想退货。

What's wrong with it? 有什么问题吗？

It's too large for me. 我穿太大了。

Would you like to exchange for a smaller size? 给您换件小一点的好吗？

I'm afraid there is none in my size for this color. 恐怕这种颜色没我的尺寸。

Then I'll do the refund for you. 那我就给你你退钱。

I'd like to exchange this. 我想要换这个东西

Excuse me, I'd like to exchange this blouse. 对不起，我想换这件衬衫。

What's the reason? 什么原因？

It's the wrong size. 尺寸不对。

Do you have the receipt? 你有收据吗？

Yes, I have 是的，我有。