Cortana's used to people with ridiculous metabolisms, but the Chief is fifteen centimeters taller and maybe twice Barry's weight. If you're moving at speeds that shouldn't be possible, it'll burn a lot of calories, she supposes.

She edges out of his way, which puts her in front of the soda dispensers, but as long as she doesn't return to her coffee reverie, she'll probably remember she has a physical body that can block people from getting to things.

"Good work on that last op."

From Cortana, this absolutely counts as small talk.