Agame
Arcane
Caves of Qud guys use procedural generation for building histories and also to create text in books. That sounds much simpler to do than procedural speech generation. And it sucks. So probably not.
Yep it turns into "lol so random, you put words togethor that dont go togethor tehehe", you would probably get the same thing if you tried to do dialogue.
So really a complete waste of time, unless of course your goal is to make a shitty hipster "art" game, if so, please, knock yourself out!