Why did Nancy go to the store?

Salesperson: May I help you?
Nancy: Yes, I would like to return these slacks.
Salesperson: Alright. Do you have your receipt?
Nancy: Yes. Here it is. I bought them last week.
Salesperson: And why are you returning them?
Nancy: I bought them to go with a blouse of mine. But they don’t really match.
Salesperson: I see. Oh, wait. Ma’am, I’m sorry. These slacks were on sale.
Nancy: Yes, they were thirty percent off.
Salesperson: I’m sorry, but we don’t allow returns on sale items.
Nancy: I know many stores have that policy. But I have returned sale items here before.
Salesperson: I’m sorry, but we usually don’t do it. It is our policy.
Nancy: I just bought these slacks a week ago. And I am a regular customer here. Can you make an exception this time?
Salesperson: Well. Let me talk to the manager for a moment. Ma’am, the manager says I can do it this time.
Nancy: Good. I’m a regular customer here. I am glad you can make an exception for me.
Salesperson: Please show me your receipt again.
Nancy: Here it is.
Salesperson: I will have to give you store credit, Ma’am. If you find something else you like in the store, you can use the credit.
Nancy: Store credit is okay with me. I’m sure I will find something I like. I shop here a lot.
Salesperson: We appreciate your business, Ma’am.