1. It's ONE interaction. Who cares. If you have her number, give her a call or text and arrange something. If she's interested she'll agree / get back to you. If not, try the next girl.
2. Why are you trying to get the number so quickly? Obviously she's on her way somewhere but at least try and build some kind of rapport. If you n-close too quickly you'll get a lot of flakes because the girl doesn't really know you, and you haven't had much time to dispel the notion that you could be a fucking weirdo. (That's why calling is best).
3. Why say "I intimidate you." ? It's not a rapport-building, value adding, or even funny thing to say. If you're not getting much out of her or she seems nervous, just say "hey, it's ok, you don't have to be nervous - you're cute, don't worry about it

" and smile. No self-respecting girl is going to admit that she's intimidated, so EITHER WAY you're going to get a "NO I'm not" out of her. Building a YES ladder is the way to get her to agree to see you again. Don't say things that will DEFINITELY generate a NO.
4. WHY exactly do you want her number? WHY are you even talking to her? Have you made it clear that you find her attractive and want to get to know her and pursue some kind of romantic relationship? If not, WHY NOT?