Help – resources needed for chatbot conversation UX

Hello!
I’m making a chatbot as a personal project which intends to have human-like conversations.
However, mainly due to the lack of training data and all the possibilities of conversation topics, I’m finding it hard to get that human-like conversation flow.

Does anyone know of any online resource which could help me in learning how to design better chatbot conversations? My aim is not to make this a customer support chatbot, but just to have a friendly conversation with it.

Side note: I’m using DialogFlow for the chatbot, just in case you were wondering.

Thank you!