He's participating in the Cloud City evacuation, of course. But you knew that. He's on screen for about 1.5 seconds.
After deep deliberation the Internet determined this is a space age ice cream maker. And who would want to leave that behind if your Cloud City was about to get blasted?
Given the Rule of Lucas #3: Anything that can be marketed will be marketed - the Internet in its great wisdom divined that we need only wait for a name for this dude. Given Star Wars novels, comics, and relentless toy machine, it was only a matter of time until he got his own action figure. And voila!
Lucas has made it so: Willrow Hood. Space age ice cream maker and deputy of security, sector 23.
Of course the other black guy on Cloud City is named Hood. Subtle.