This simple bot was built baed on Tomomi Imura tutorial at http:https://www.girliemac.com/blog/2017/01/06/facebook-apiai-bot-nodejs/.
To get the bot working is needed to have at leas three environment variblaes configured.
PAGE_ACCESS_TOKEN=my_access_token
API_AI=api.ai_token
WEATHER_API_KEY=openweathermap.org_key