I came across a wonderful quote from the book, Fierce Conversations by Susan Scott:

"All conversations are with myself, and sometimes they involve other people."

This makes me think of a recent conversation with a stranger, who seemingly was in dialogue with me. Yet he lacked the self-awareness to know that he was being a bore. He was truly having a conversation with himself, with several people present. 

And Ms. Scott makes a great point, that all conversations reflect our inner state and relationship with ourselves. The trick is to be aware of it.