A great idea, and it's so close to being perfect. Feels like you need just a bit more training data, because right now the dialogues (at least the three that I tried) feel a bit railroad-y.
UI is serviceable, acts a bit weird when you try to resize it - and it also froze on me, so I needed to change the config file.
I think this is the first time I've seen AI used properly. Hope you'll get more data and make the characters more responsive to player shenanigans!