"Yeah, I guess so," M'gann was really just overhearing the statement while drifting over to see if any of those drinks had cooled a little. It's reflexive that she answers it, all before looking at who spoke. "But it's so different from what I usually get to do, and-"

And-

...Oh. Hello, person she sang at in the past! M'gann tries not to freeze up, and also reminds herself that she's in her super hero ID at the moment, instead of a civilian one as she scrambles for more words.

"A-and it's...Been fun so far? Right?" Okay, friendly social question asked; good first step! Now she just has to work on making eye contact without staring or looking like she's analyzing him too closely.