Mettaton gives another sweeping bow, glittering as he lowers in a fantastic array within the party lights. The other dancers begin to depart the floor, and he straightens back up again, his grin still firmly in place.

"I suppose this is the end of our dance. And while I would love to monopolize your time more, I'm afraid I should probably share you with the rest of the party."

This didn't result in any interesting or new information that he can pass on to the Resistance, but Mettaton can't label it a waste. Time is never wasted when you're having fun.