Too Long; Didn't Read
There are plenty of easy-to-use bot building frameworks developed by big companies. I had a chance to take a close look at <a href="https://dialogflow.com/" target="_blank">Dialogflow</a> (formerly known as API.AI; developed by Google) and <a href="https://dev.botframework.com/" target="_blank">Bot Framework</a> (developed by Microsoft). Both Dialogflow and Bot Framework have pre-built custom language understanding modes. These frameworks seem to be great tools to get you started quickly, especially if you don’t have existing chat logs that you can use as a training data.