Goodbye mr hollywood

I read GOODBYE MR HOLLYWOOD.
The mysterious girl is so mysterious for me. Because her action is so crazy. For example, she said to this story's main character, Nick why he doesn't know her, but he had ever met her at once. And she kissed him suddenly. I didn't understand. I don't have enough knowledge about these things, but if I know this, I couldn't understand. Therefore I didn't understand this story...

'Hi! I'm Jam,' she said. 'Do you remember me? We met at a party in Toronto.'
'Hi, Jam,' said Nick. He smiled. 'I'm Nick. But we didn't meet at a party in Toronto. I don't go to parties very often, and never in Toronto.'

vocabulary
gun 銃
vacation 休暇

Reference
John Escott GOODBYE MR HOLLYWOOD