Hey, I'd like a pack of cigarettes please.
Sure, can I see some ID?
Umm, I'm kind of in a hurry. I left my ID in the car.
I'll be happy to hold onto these for you so you can go get your ID.
C'mon, don't I look old enough? I'm obviously older than 18.
I'm sorry. I have to card everyone who looks younger than 27. If I don't, I can get fired. Is there anything else I can get for you?