Based on Interactional Sociolinguistics and Conversation Analysis theories, this work investigates the mediator role in conflict management between costumers and product and services suppliers in conciliation hearings in a brazilian Small Claim Court (Juizado Especial de Relações de Consumo). The date consist of tape recordings of talk-in-interaction in work place. Conflict resolution in institutional settings is distinct from informal dispute because its procedures define especific roles for each interaction participant. A particular institutional mandate determine a interactional organization where the participants rigths suffer restrictions that are absent in ordinary conversation. Norms expectations, distinct participation status and sequence of procedures are features of conciliation hearings that make possible to identify two moments in the hearings: narrative and negociation. Analysing the mediator role in the narrative moment, it was observed his co-contruction of the consumer narrative by questions and formulations. Thus, the mediator align himself most of the time with the consumer side during the conflict narrative. In the negotiation moment, he may change his alignment in order to do a institutional task of making agreement between disputants. Finally, there is an argument that mediator alignments are oriented by his institutional work.