Someone is going to find you quite attractive today.
Although unfortunately , they might not be someone who you find very attractive.
Learn how to take a compliment and move on.
There is no need to chat someone up if you have no genuine interest in them.
In fact, it's not very nice. Leading someone on even if you're just trying not to hurt their feelings is not the right way to handle things.
When someone says something nice, thank them .
That's the extent of your responsibility.