Need AI Chatbot (NLP)

I am looking for a freelancer to develop an AI chatbot model (NLP) that will be deployed on my website.

Chatbot Features:
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1. AI model would be pre-trained on our existing chat dialog flow (questions & answers) and company documents
2. Customers should be able to enter their data through chat dialog flow (Already existing) and train this AI model
3. Model should have document input link which will be used in future to train the model
4. The model used should be able to call API's (Intent/actions functionality) in future (Not in scope of this project)

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