I used Principle to prototype a chatbot interaction. I even did a livestream, if you're curious:

https://www.youtube.com/playlist?list=PL2OmTGHFxd2EaWjh9WlhpMySntHeoyUhz

There's a lot of ready-made tools for prototyping conversational UIs like https://botsociety.io

But if you have your own design, it's quite easy to prototype it in any tool out there - it's simple conditional logic ¯_(ツ)_/¯

In our recent case we wanted to explore microinterations for chat more so we went with Axure and did this for a client: http://allprototypes.com/client/tradewise/prototype.html

Use something like Chatfuel.

You can get a functional Messenger bot up and running in under 15 minutes. Super easy way to test conversation.

Your use case sounds really interesting. You could try out Engati Chatbot Platform, which allows you to create a bot and you can integrate the bot on eight major messaging platforms including messenger, kik, telegram, line, viber, skype, slack and webchat. It gives you an option to have a FAQ bot, or a customer centric bot which is based on customized requirements.

You could start building a bot on www.engati.com

Happy botting!!

https://www.motion.ai/ has been a great tool for quick prototyping. It has multiple chatbot platforms that you can create: SMS, Messenger, web-based.

I created a small bot with meteorjs and retext npm package

Botframe by Al Monk ticks most of those boxes.

https://botframe.com/

https://dl.dropboxusercontent.com/u/11182187/chatbot.png

Framer FTW

Could that possibly be achieved with Principle?