My mother used to tell me that having a conversation is like tennis: you hit the ball to them and hopefully they return it back and you continue to volley. It's not that you can't learn the art of conversing without a pen pal but the written form requires more intentionality thereby engraining the habit deeply. I do know a little about many topics which aids in being a good conversationalist however, knowing how to ask questions like a 20/20 reporter was instilled mainly through the couple pen pals I had as a child.
I love technology but it's seriously eroding our societies ability to interact with people we don't immediately have something in common with. Instead of bringing us together, technology is further segmenting us into groups of similar people through algorithms and preferences. Like I've said before, I enjoyed riding public transit when I lived in LA because it forced you to interact with other humans you may not have normally chosen to be around. If you want peace in the world, you can't just hang with people who are like you. Shake it up and get to know someone who may be very different than you. Write a letter and hell, use a fucking stamp for Pete's sake.