Hello, I bought a shirt in your shop this morning.
Yes.
I bought 1 size too large by mistake.
Oh, did you?
I wonder if you could change it for one size smaller.
Yes, of course. Please bring your receipt when you come.
OK. I'll come to your place later. Now it is 4:00 PM. How late is your shop open?
The shop closes at 7:00 PM from Monday to Friday. But today is Saturday, so we will be open until 8 o'clock, sir. We look forward to seeing you.