dialog kania and damar

Kania : "Hello Damar"
Damar : "Hello Kania"
Kania : "Did you know that there are compulsory after-school classes now?"
Damar: "Really? Are you sure?"
Kania : "Yes, I'm quite sure. It's from a reliable source, you needn't worry."
Damar : "And who is your 'reliable source'?"
Kania : "Calm down, it's our class teacher. He is a reliable source isn't he?"
Damar : "Okay, I give in. Thanks for telling me."