The first and best defense is to always be mindful when your eyes meet. Relationship coaches would say that it’s important to keep eye contact for more than a few seconds in order to show that you are interested and engaged with the person you are talking to. If your eyes wander, girls will think less of you – period. If a girl feels as though your gaze is constantly drifting away, she may immediately stop looking at you, or at least withdraws her focus.
If all else fails, try something cheesy like complimenting the person on their appearance or asking them questions about themselves. When well executed, these sorts of things can get a girl interested in talking to you again and make her feel as though she’s being treated politely and attentively.