Wish Fulfillment

If you have a wish you want to come true, then catch a demon! When the clock strikes midnight on Friday the 13th with a full moon, place two mirrors facing each other. A demon will walk along the pathway between the two mirrors. At that moment, use the bottle you have prepared to seal it up. If the demon does not grant your wish, it will turn to dust. If you catch a demon, what will you wish for?