Build Chatbot for Website

I need a developer to create a chatbot for my website. The chatbot should be able to answer questions, provide information, and improve user interaction based on my own proprietary information which will be stored as text files on Google drive. I am looking for someone who can build a reliable and user-friendly chatbot that integrates smoothly with my site. I am thinking about a simple Google-like interface where users can ask a question and the chatbot will reply with our own methodology, not with generic answers from internet. Ideally, the chatbot will be able to communicate and ask questions if necessary to collect all important information from the user before providing an answer.