Informal Talk
Friendly Talk
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.
授業参観日の先生との懇談の間、彼女はずっとハンカチを握りしめてていました。
She was tightly clutching her handkerchief throughout the friendly talk with the teacher on parent’s day.