noun, verbal noun
A courteous discussion is a little more formal than a friendly talk (because it's a discussion), but it's still fairly informal on the discussion scale, making it an informal talk.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
She was tightly clutching her handkerchief throughout the friendly talk with the teacher on parent’s day.