The mark of a good conversationalist is not that you can talk a lot. The mark is that you can get others to talk a lot. Thus, good schmoozer's are good listeners, not good talkers.
If you can listen well, people will say you're a good conversationalist.
If you want to be a good conversationalist, be a good listener. To be interesting, be interested.
So if you aspire to be a good conversationali st, be an attentive listener.
The one seeks a midwife to deliver his thoughts, the other, someone to assist: thus a good conversation comes into being.
Good writing is good conversation, only more so.