Conversation in the classroom

Have come across this online and it resonated well with Dr van Hess  - Need to increase conversation in the classroom. A conversation is chain linking what you say to each other = 

A big number of my learners . need to learn how to be conversationist. My challenge is to establish situation for conversation rather than asking questions.

One situation during our maths lesson - Problem Solving - students don't use their book n pen. They have materials and the problem. They talked & discussed the problem. Still in the early stage. The talking is predominately done by the knowledgeable and capable learners.  I have to facilitate the conversation.