Heat the cast iron skillet up over a medium high heat. Take a rolling pin and dust it with a little flour to prevent the dough from sticking and then divide the flat bread dough into two equal sized balls. Roll each of them out into a thin oval around 2-3mm thick. Shape the edges into an oval shape as best you can using your hands, patch up any small holes by removing a little dough from the edge and placing it over the hole.