@MovieMaker you could always add a bluetooth speaker to your robot, like I did for my ROB.

If you own an Echo device you can connect it to a Bluetooth speaker (within your robot).

How do you want to use Alexa on your robot?

Check out some of the links in the AI bot response. It looks like a number of people have added Alexa and Alexa echo or dot to their robot. Seems like there's a number of ways to do it - with IFTTT as well

Yeah looks like the forth link (Using Amazon Echo) is explaining the answer.