I SMH at people using a flash, besides for the obvious reason. They just won't help the photo and most of the time make it worse. You can't take dark room and make it suddenly bright, especially with those puny smartphone LED "flashes." Granted, without you'd probably get nothing. Either way, it's not going to be a good photo - so sit back and enjoy the ride.
Now, if you've got "a real camera" then crank up the ISO (1600 at the very least if not 3200+) ensure your shutter speed is reasonable (1/15-1/30+) and use a fast lens (f/2 or faster, preferably f/1.2-1.4). Even then, it'll be hit or miss most of the time, depending on your camera. And make sure you turn off your AF Assist Light.