Fine-tuning 3.5 turbo to act as conversational AI like Non-Playable Character in games

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You can try these solutions:

Fine-Tuning for Retrieval Augmented Generation (RAG) with Qdrant | OpenAI...

How to prevent ChatGPT from answering questions that are outside the scope of the provided context in the SYSTEM role message?

I’ve set this ‘post-prompt’ (below), and it ran well on this example. Maybe my non-native English didn’t help with writing a good prompt. This time, I asked chatGPT to help me write a direct order in English, and it suggested this: $post_prompt = " Do not give me any information about procedures and service features that are not mentioned in the PROVIDED CONTEXT." And this worked as expected. Fine. [USER] do you have a way to generate questions and answers from a document? + $post_prompt …

Otherwise embeddings are the way to go as @sps pointed out.
You may even be able to cut down costs and get faster responses by using a standard model with embeddings.