[Python] How to integrate RAG with a fine-tuned AI model to access real-time API data?

I fine-tuned an AI model and now I want to integrate Retrieval-Augmented Generation (RAG) so it can fetch real-time information from an external API — for example, checking status updates or current data. How can I combine RAG with my model to achieve this? Any tools, frameworks, or examples would be really helpful. For example, I fine-tuned my AI model to act as a client assistant. However, if a user asks about their shipment status, the model doesn't know how to handle that. How can I train or configure my AI to recognize when it needs to ask for the shipment code, use that code to call an external API, and then generate a response based on the API result?

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