I have three bartenders in my mod. all three share a dialog quest. 2 are Human NPC's. The third is a Robobrain. The 2 humans work fine. You talk to them they offer drinks, the batter window comes up, then afterwards the goodbye option shows up to leave dialog. However with the Robobrain the "goodbye" option does not show up. When initiating conversation, the only option is the line that accesses the barter menu. Even after the barter menu closes the only dialog option showing up is to return to the barter menu. There is no way out of the conversation. I'm thoroughly confused here as all three bartenders are assigned to the quest in the same exact way. My only guess is that "creatures" are handled differently with dialog options maybe? Maybe the Goodbye option is not defaulted in to the conversation for creatures? It's the only thing I can think of, but it's pretty silly either way. I just want my Robobrain Bartender to work. Any help or ideas on how to fix this?

Just add a top level topic to your quest, with a condition of GetIsID for the RoboBrain. Then add an info to it - 'Goodbye', and check the 'goodbye' box.