Create Assistance Service

Hello! I have to build a chatbot to answer question about my service
I have research and the way to do it:
1)Create text document and build Q/A system to answer all question related to service.
2)Or fine turning model using history conversation.
What is the best solution, assume I will use chatGpt, Can I fine tune Flant-T5 for this purpose?
Thanks you so much
Dat

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