It was not an assitant in a sense of Alexa or Mycroft, but some kind of an automation. I may be mistaken here, but it may have also come in a form of a browser extension. The showcase demo was most likely either a video or a gif.
Could anyone kindly remind me what exactly the product was and provide a link to the HN discussion?
Probably this: https://news.ycombinator.com/item?id=32842860