Looking for a developer that could build an AI chatbot

After a freelance developer who can create an AI chatbot for a website similar to the one below -

https://pub.towardsai.net/build-chatgpt-like-chatbots-with-customized-knowledge-for-your-websites-using-simple-programming-f393206c6626

We need this to be a bot that can be embedded on a website.
The questions and answers must be customised to the copy on the website.

Please provide a rough estimate of time and cost in your quote!