I think you did good, also, the story made me smile.
Yeah, that's the ESP test. I'm planning to try it this way:
Tell the girl you want to show her a cool trick
If shes okay with that, tell her to imagine a blackboard
Then tell her to draw the first number that gets in her mind from 1-4 (most people think of 3).
Take her hands and look into her eyes.
"read her mind"
Tell her that you can see the same blackboard, and that the number written on it is 3.
You got it right or not, now try it again with 1-10:
Tell her to wipe off the old number from her blackboard, and to write a number from 1-10 (should be 7).
Do the same "mind reading" routine.
If you get both right, you could tell her that we seem to have a special connection, or whatever you get in mind.
If you get both wrong, you could tell her something like: You're the first person ever i couldn't read. You're going to mean trouble. I'm not sure if i can stay around you anymore.
Probably need to do some fine-tuning on that one.