His response is definitely a surprise, and for a second Anna doesn't quite know what to say back to that. It's not that she doesn't appreciate him being here, because she really does, it's just that she's not used to him being quite so expressive. She'd been expecting a courteous nod at best.

She should say it back, that's what is done during times like these, but she can't quite get the words out of her mouth and instead she just smiles and gives him a nod in return, looking around the room a little before going back to Cas with a quick subject change. "So, what have people got you?"