Can the parties resolve the conflict themselves?
In the first instance, where conflict arises between people and they feel able to express their concern safely, they are to go to one another and express their concern with a view to resolving their differences directly. Where people go in gentleness, patience and humility, with the resolve not to ascribe fault and take responsibility for their part in a conflict and its resolution, they often find that a dispute is resolved quickly, and a relationship restored.
If this step does not work or is inappropriate you should talk with your Parish Priest or Chaplain. They will lead you through the next stage of the grievance process. If they are a party to the grievance you can contact your Assistant Bishop or Archdeacon.