Apologize for a misunderstanding

Pau: Excuse me. Can I have a work with you?
Pau*:Yes. Is there any problem?
Pau: I'm afraid so. Did you know that this pub isn't aloud for people under 18s?
Pau*:No, I didn't.
Pau: Didn't you see the sign?
Pau*:No, I'm afraid not.
Pau: Have you been here before to drink something?
Pau*:No, that's the first time I come.
Pau:Well, if I were you, I'd look for a different place.
Pau*:OK. Sorry about that. I didn't realize.
Pau: That's OK. Remember for the next time.

KEY PHRASES

Can I have a word with you?

I'm afraid so / not.

If i were you, I'd...

Sorry about that.

I didn't realize.