Thanks for the nice tutorial Naga Kiran!
The case studies we have written on BERT based QnA ( https://www.pragnakalp.com/case-study/question-answering-system-in-python-using-bert-nlp/ ) and Closed-Domain Chatbot using BERT ( https://www.pragnakalp.com/case-study/chatbot-using-bert-in-python/ ) are also on same line and would be useful to readers of the blog.
Hope this helps!