Recommend natural language conversations tool beside dialogflow

Hi Guys,

I am horrible new to natural language conversations. I just recently learned about Google’s Dialogflow ( I did said I am horrible new… ) 

Could anyone be so kind to recommend me anything else beside using Dialogflow for a travel app.

Thank you x 3 in advance. 

Amazon Lex seems to be the Amazon-version of it. Try Googling “dialogflow alternative” and a lot of stuff pops up. Are you looking for a specific kind of alternative? What don’t you like about DialogFlow that you would love to see in an alternative?