How to indicate personal communication preferences to a co worker?
He's my junior, just started working less than a year ago. He is ALWAYS texting me questions or to to recheck his work without even saying hi, goodmorning, goodnight, or even "sorry to disturb," which to me is common courtesy. How can I go about getting him to include greetings in his messages to me?

He's my junior, just started working less than a year ago. He is ALWAYS texting me questions or to to recheck his work without even saying hi, goodmorning, goodnight, or even "sorry to disturb," which to me is common courtesy. How can I go about getting him to include greetings in his messages to me?