A great example was someone did this with Skyrim a while back. In the dialogue they convinced the NPC to join their party. But there isn’t any code logic to allow that, so the NPC is talking like they joined the person’s party, but the gameplay itself doesn’t support it.

That’s the exact type of scenario I was thinking as well. I had seen another video for Skyrim with AI dialog where they used it to haggle with a merchant who agreed to drop the price of an item in the shop. But an item’s gold value is baked into the game itself. An NPC can say they’ll lower the price, but it will still cost the exact same (barring the normal modifiers based on skills/quest completion/disposition/etc.)