dont give up!! maybe she really had a appointment! have confidence and beleive in your self! try and talk to her more at work so you two would get to know each other, one thing i know is its normal to get rejected when you ask a girl out so dont give up yet! lol talk about rejection... i got rejected 3 times when i asked girls out, anyway wish you best of luck!!

btw nothing to do with this thread but i got a question for 電気男, did you succesed?!! didn't hear from your story for a while and now i read that you have a gf!!? all i can say is CONGRATS!