Need a good prompt, anyone got a good one?

I have a few requests...

First, I want the AI to stop going, "Your turn!" I want the AI to end stuff naturally. It feels annoying to me, like it's​​ telling me I don't know how to tell when the message ends...

Then I need it to write like a pro. I want it to be somewhat unpredictable too. I know that the built-in model is free, and that sometimes quality comes with a price... But I want to know if there's a way to make it not write so boringly.

Finally I want the AI to write dialogue that feels human. I want it to write in a way a person would. Who overuses 'Wel, well well...' and 'Now what?'.

If better quality isn't possible with the base model, then I'm open to suggestions (as long as it isn't too expensive like $35).