Have you ever felt really good after a long talk with a friend? On the contrary, have you ever felt like you couldn't get a word in edgewise with someone, and you felt a great sense of relief when it was all over?
Why is this?
Because everyone enjoys talking and we all appreciate being heard.
Good conversationalists listen much more then they talk. They also ask more questions from you, rather than feeling compelled to give "all the" answers. It almost seems like a contradiction, but it's true, those who are the best conversationalists hardly talk, instead they draw you out in the conversation.
If you are engaged in a conversation, don't make it one-sided and all about you, or you'll quickly find you have an audience of one...