No, it wasn't River. Of course it wasn't. Still, even close up, this girl could have been her twin. There were differences, of course, but not things easily spied.
Simon felt disproportionately disappointed that this wasn't River. "Sorry," he replied. "It's just ... I have a sister and she ... you ..." Simon struggled to find the word he was chasing. "You look like her," he finished as he studied the young woman. Allison. Not River.
He stood awkwardly for a moment, torn between wondering how this was possible and actually asking about it. It wasn't likely that she'd know though, so he shook his head. "Sorry," he repeated before drawing his hands out of his pockets. He transferred his bag to the left, extending his right to her. "Simon Tam," he introduced himself. It only seemed fair he knew her name, after all.