"Thanks. If you could not tell it to anyone, that'd be great. My identity's a secret and I'd like to keep it that way."
"You...could?"
This implies that there is a condition coming...
She grins
"Thanks Kats, I appreciate it!"
She stretches
"So uh...I'm just gonna go...casually scout around the prison...for no reason in particular...heh..."
She just smirks back at him: Sorry, but it's what I do!