Customer: Excuse me. This coffee says $4 on the shelf, but your scanner says $6.
Cashier: The scanner shows the current price. It is $6.
Customer: But the label says $4. I chose it because of that price.
Cashier: Let me look. Oh, there is a small date here: “Special price until 6 October.”
Customer: Today is the 8th. I didn’t see that.
Cashier: The offer ended two days ago. We changed the price in the computer, but someone forgot to change this label.
Customer: So the scanner is right, but the shelf is wrong?
Cashier: Yes. I’m sorry. I can ask my supervisor to check, but the offer has ended.
Customer: All right. I’ll buy it for $6 this time. But please change the label. The next customer may not notice the date either.
Cashier: You’re right. I’ll tell the supervisor now.
Fiction note: The people, shop, prices, and events in this dialogue are fictional.