I saw this girl come into my job and after I made eye-contact and smiled at her I noticed she was giving me IOI's such as looking me up and down and turning around a couple of times to see me out of the corner of her eye when I was coming in her direction from across the room. I later found out that she was there for an interview and I think that it was her introductory interview, meaning she got the job. I was wondering how I should go about doing this or if it's a bad idea to try and get your co-worker's number at all. I don't really have a problem approaching but I've NEVER closed on a number before. I appreciate any advice.