Make open staement for mediation class .. take a look to this videos. It is also has a roles that you can follow when you write it .. ( I am attching the rouls ) genral opening statement for mediation..
Mediation: A Neighbor to Neighbor Conflict Role Play - The Mediation Process
1- https://www.youtube.com/watch?v=KS-ykB7nYiY
Until 3:25 minutes
"Resolving Conflicts Through Mediation"
2- https://www.youtube.com/watch?v=ZBeUbpIq2Uw
Review the Mediators Opening statement 9:19- 12:05 minute