导购口语:

If you are not satisfied, you many return it.
如果你不满意，你可以退货。
We only accept returns for thirty days after the purchase.
我们这里的货物在卖出后30天内可以退货。
Bring your receipt to the customer service, and they will refund you.
把你的收据拿给顾客服务部，他们就会退钱给你。

语句解析:

Accept returns可以退货，return作动词时，是“归还，退回”的意思，作名词时，意为“退货”，常用复数形式。

情景再现:

What happens if I am not satisfied with my purchase?
假如买了以后不满意怎么办?
Our bookstore would accept returns provided that books are in good condition.
我们书店不久受退换的书，除非书完好无损。