A: Did you enjoy your dinner last night?
B: Oh, yes. The food here in Iran is delicious. My host offered me so many new things. As soon as I finished eating a new dish, my host offered me more, and I immediately said yes. I ate so much! It was so good!
A: Well, actually, you know, you'erre not suppsed to accept more the first or even the second time it's offered. It's the custom to accept it on the third time.
B: Oh, no! I wasn't aware of that.
A: Yeah. It shows respect for the host.
B: What should I do?
A: I wouldn't worry. you'll know better the next time