Leonard perked up at the familiar voice. He couldn't mistake it anywhere. He set down his glass and looked over at that smile. No offense, Chekov, but he's not returning it. Not in the mood. He does, however, look less like he might shove a hypospray in someone's neck if they get too close. And maybe a touch worried. If Chekov's claiming no one else is here, then...

"How long have you been here, Mister Chekov?"

If this really isn't an elaborate prank, Leonard's hoping Pavel's been poking around and can give him some type of information.