what is the effectiveness of communicationg when two people are talking, can someone give me an example as if you were observing them

What happens when two people argue? Does someone win the argument? If so, how does that person win the argument? Are there times when no one wins the argument? Why?

What happens when one person asks another person for directions?

What happens when one person tells another person why she is so happy today?

Etc., etc.

What can you think of?