You are lucky indeed. Usually better choices at work. I was never good at fielding them, either. Sometimes I would laugh at the most ridiculous, far fetched lines, especially if I was obviously on a date. Guys don't seem to like that. ;-)
I tried the straightforward approach once: "Hi, you're very attractive, and I'd like to get to know you better." Her response: "You're too short for me".
End of bar scene for me.