The Doctor quickly turned to look at the girl that had spoken to him. "You're not from here." It was a statement more than a question, and it wasn't that hard for him to have figured it out from what she had said. It was probably that she was just from another city or something.
"So. What planet is this?" he asked, brow perked as he pulled his sonic screwdriver from his pocket to begin scanning the area. Perhaps he could pick something up. If nothing else, it could point him in the direction of his TARDIS, and from there he could probably figure out where he was easily.