[Walker. He's heard that word before, but he's not sure where. At least it's clear she's new.]

It's kind of a long story. And I know it's probably not easy to trust me, but you're safe here.

[Assuming there's no sneaky event going on.]

I'm Sirius. You want to come sit down so we can talk?

[He can take her to the kitchen so she can use the sink to clean up a little if she wants, maybe get some food.]