“You say it’s a coincidence,” she says, angrily. Clearly she doesn’t believe it.
“As far as I know, it is. I can’t prove he didn’t assume my name for some reason beyond me, though I consider that very unlikely.”
“Look, if it was just the name, that would be one thing,” she says. “But a wizard to boot? That almost seems like a taunt.”
Obviously, she’s trying to see if you seem surprised, because if this really was coincidental you probably wouldn’t know about this “John Long’s” longstanding interest in unusual forms of magic. Actually rather clever of her, really.
Unfortunately, because you’re remembering things from the future, you are aware of it and so any attempt to seem surprised will probably come across as artificial. Which means you’re going to need a different approach.
And, because apparently this future memory of yours can never be a convenience, you can’t remember what you’re going to do. So you’ll just have to improvise on that point.