There's a coworker who will playfully teases me, she might have a crush on me but that doesn't really matter. It don't mind the teasing, in fact I actually like it. What does matter though is that I don't know how to respond back to keep it light hearted and playful. (Example) There's two departments at my work. The other department has to wear all blue, but my department doesn't really have a dress code. So one day I come in wearing blue and she goes, "why are you in blue? You leaving us already?" My dumbass self didn't know how to reply so I just go, "No, I just felt like wearing blue today." It totally killed the mood. How do I get better at flirting or having a colorful response?