I was having problems with a ForceGreeting on an NPC. I had 'ForceGreeting' in the Remarks section of the only dialog, and a script that was supposed to get the NPC to attack once the greeting was through, but it doesn't seem to be working. The NPC gives the greeting then nothing. Any help?
As Pluto mentioned, you need to tell the NPC to start combat with the player in the dialog results box. I would also use SetFight 100 between Goodbye and StartCombat Player.