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I have no prior experience on this. I need a guide or link to read up.
In your case, the first thing to do is to learn on the subject, and do some research on internet, Google is your friend, Wikipedia too.
Chatbot - Wikipedia[
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I am trying to implement a chat BOT, but the few examples I am seeing online are on Echo BOT
That is probably because a ChatBot is cutting edge, state of the art technology, this means that there is no efficient library/package available for free.
All you will find is probably ready to use paying packages.