I build a simple module to use api.ai inside your prototypes. You can use it for text strings in chatbots and you can use speech recognition on framer side and query solving on apiai side of things if u are prototyping some voice assistant like google home or alexa. https://github.com/mamezito/Api.ai_module_FramerJS. I will showcase more extending version of google home during next London and Amsterdam meetups in January and explain how this thing works.
By the way, if anyone hiring prototyper, especially in conversational UI area, let me know ;)