I found, so if needed also need help to have several people in the comnbat group after dialogue, put the bandits in Evil NPC and range of vision to 1, the person in the dialogue in neutral good npc and of course in a group.
That way, if you trigger the combat via the doalogue, the other enemies will be in it and if the combat is triggered via other enemies without dialogue, the character who has the doalgues will also be enemy in the group
