Practice makes perfect. Look in front a mirror. Flirt with your reflection. Know what to say. The more comfortable you are with saying the phrases, the more comfortable you will be when flirting with a real person. As stupid as this may sound, it will work! The reason why some people aren’t able to flirt is because some people do not know exactly what to say. But if you have practiced what to say, then you will be able to flirt properly when the time comes.