Consider that most person-to-person communication is a bid for attention in some way, or alternatively an attempt at persuasion. The person communicating wants something from another person, either directly or indirectly.
So when you’re on the receiving end of communication, think about what the other person wants. What would make them happy? What would brighten their day? What would create ease for them?
Then you respond with that in mind. You help them feel at least a little better than they did before receiving your response. You give them a gift.