If tossing her hair, smiling and fidgeting with jewels are signs of flirting, there was a woman flirting with me a few minutes ago on the metro. On the other hand, she never looked directly at me, although we were standing side by side near the train's door.
Of course, there is no way a woman that attractive would want anything with me. Besides, I am bad enough at talking with people I know: random strangers are definitely out of question.