And then he's laying on the charm (his own version of it, which isn't the same as Sam's puppy impression, but he's hoping it will do the trick) - "I'm Dean, Lea's... friend." (It's easiest to settle for Abby's turn, because saying he's got a girlfriend makes him feel about 12) - crossing his arms over his chest and ramping up the concern he's been trying to hide, hoping it substitutes neatly enough for sympathy. "So what happened to, uh..." - another glance at Abby, and a brief pause as if his memory's failing him, inviting her to fill in the gap for him. She's the best lead they've got, after all, and excluding her from the conversation, siding with the adults dismissing it as nonsense, isn't going to help them rescue anyone.