Seeking guidance to detect create knowledge base for chatbot using ML

Hi, Please guide me to detect question and answers from pdf documents containing medicinal drug related information to create knowledge base for chatbot as I am completely new in this.

Chatbot contains three parts:

  1. NLU - natural language understandings (which is similar to text classification) identifies the need of the user input.
  2. NLG - Which provides the response based on the NLU outcome
  3. State machine: in between NLU / NLG to maintain the conversation flow.

By combining this three parts, could develop the chatbot for any specific purpose.

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