https://www.cnet.com/news/microsoft-shows-alexa-and-cortana-working-in-smart-harmony/

The two seem a good match: Cortana, with its Bing-driven search technology and Alexa, with its Amazon shopping prowess and a broad base of hardware and software, could be ideal for the voice-commander crowd.

There seemed to be some awkward hesitations in their conversation during the demo, but you can definitely see where it's headed.