I, personally, was born quite without social skills. I'm finding that the principles at work in a good conversation apply equally well to the practice of pairing. Also, just like the art of conversation, while some have greater natural talent for it, everyone can improve in their pairing skills. Almost always a conversation begins with a question. My father often drives me nuts because he's so good at the skill of asking questions that it's often impossible to get him to leave a place as his conversation goes on and on.
Questions are a constant part of a good pairing session.
Many times a vocalized explanation of what is being thought about will bring about a new understanding of the problem or its solution. Before he could even get two words out of his mouth, the original asker of the question had turned around and started talking to someone else. That put a quick end to the conversation. It is critical that both members of a pair maintain a high degree of interest and engagement with the problem at hand. There is an automatic feedback loop here, because as interest is shown, the conversation gets more interesting, meaning that an even greater level of interest is shown, etc.