Dragon Boss strategy?

So I'm stuck in Cuphead at the dragon boss. I can't say I can see any attack pattern he follows is he really just a random attack pattern? I've been using the charge cannon for him.

I've had a really tough time with this boss as well. Some tips that you might find helpful:

1. In the first phase, try to stay near the left edge of the screen until he sticks his tail up, this attack is much harder to deal with if it ends up in the middle. By staying on the left, you'll leave yourself more room on the right when it comes up. The ring attack will always travel towards where you were when the rings launched, and the meteor attack will start at a random spot (but travels in a regular pattern).
2. In the second phase, watch for the flames jumping from his tongue. Before they jump, they will grin and face the direction they're going to jump in. If you can get on the side they're not facing (behind them) before they jump, they won't hit you. I try to stay in the middle of the screen for this part, as it makes it easier to get on the other side of the flames before they jump.
3. In the third phase, try not to hit the flame projectiles, since they will split when you shoot them. I also try to stay either at the top or bottom of the screen for this phase, since this makes it easier to avoid the flamethrower attack (which is only in the middle).

Also, remember that avoiding damage is the highest priority. You should always try to face towards the boss so you can hit him, but making sure you avoid an attack is more important. This boss is certainly harder than most of the ones before him due to the cloud platforming during the fight, but the bosses in the second half of the game will continue to become even more difficult.