Your innate magic comes from connection to the Elemental Plane of Air.  You might be a mortal descendant of a djinni or perhaps a distant ancestor made a pact with the primordial forces of that plane.

Elemental Ancestry

At 1st level, you learn the Gust cantrip. This counts as sorcerer spell for you, and does not count against your number of sorcerer spells known.
You can speak, read, and write Primordial. Primordial is a guttural language, filled with harsh syllables and hard consonants.

Light Step

You gain an additional 10ft of movement, and when you take a Dash action on your turn, the maximum height and distance of any jump you make is doubled for the turn.

Evasive Instincts

At 6th level, your instinctive agility lets you dodge out of the way of certain area effects. When you are subjected to an effect that allows you to make a Dexterity saving throw to take only half damage, you instead take no damage if you succeed on the saving throw, and only half damage if you fail. You can use this feature a number of times equal to your Charisma bonus. You regain expended uses when you finish a short or long rest.

Elemental Form

At 14th level, you can use your action to magically transform into an air elemental. You can use this feature once. At 18th level, you gain an additional use. You regain expended uses when you finish a short or long rest.

One With The Wind

At 18th level, you gain the ability to fly at a speed of 40 and hover. You also gain proficiency in Dexterity saving throws.