That kind of a question is only put up from a child. For your question, there are no known flying reptiles, unless you mean in the time of dinosaurs where a few dinos could glide.
There are no 'flying' reptiles in today's world - HOWEVER - Some species of snakes and lizards are able to flatten their body and glide for short distances through the air.
The flying reptiles that lived during the time of the dinosaurs were called pterosaurs, meaning "winged lizard". Some examples include Pteranodon, Quetzalcoatlus, and Rhamphorhynchus. They were not...