Asthma can be cured somewhat temporarily but in reality there's no actually full on cure for Asthma and if you have Asthma it will be lifelong.
As long as you keep the Asthma under control and follow your doctors advise and use the inhalers like you're supposed to and avoid allergens that could flare up the Asthma you shouldn't have too many Asthma Attacks.
If you do have an Asthma Attack take your inhaler and get some medical attention by getting to the hospital or calling 911.