I was selling tickets the other day and a woman came up with a voucher she wanted to use. I had a quick look and noticed it was for another cinema.
Me: I'm sorry, this is for (Cinema A) and we're (Cinema B), it won't work in our system.
Customer: Oh... but aren't you (Cinema C)?
Me: No... but it wouldn't help if we were. This voucher is for (Cinema A).