I know I should return them earlier, but you know as I said just now, I bought them for my son. He went on a vacation to Spain last week and just came back yesterday. So could you extend the expiration? OK, I understand. But did you buy them on sale? Sorry, I don't remember. Could I have a look at your receipt? Mmm, OK, you didn't buy them on sale. We can either change them for you or give you a refund. I just want a pair of shoes in a smaller size. No problem, madam. I really appreciate your attitude in attending to customers. It's my pleasure. Welcome to our store next time.