Put dialogue participants into pairs or small groups at the beginning of the process. Give them some time to chat to each other, play a game, get to know each other.
Throughout the whole dialogue process people can check in with their buddies on whatever topic suits them. You can also use these groupings to assign activities / tasks / challenges.
To know there is a person or group of people who you can always go to. To work together, process together, increase confidence, and make friends!