I have built a tool called BotFlo Autotrain which will help you extract Dialogflow intents from your chat logs.
Note: the intent extraction is based on dependency parse trees for grammar rules and such, so the tool only works for the English language. I don't know the grammar rules for any other language. :-)
I took this example dataset where people called in to customer support at a telecommunications company (the dataset already has redacted personal and other identifying information). This is actually a very good dataset since it a) is obviously realistic and b) provides a lot of insight into this topic on the whole, as you will see later.
Continue Reading An example dialog dataset