This quest is no longer available in game.
Speak with Ilsa Blusterbrew at Wildhammer Stronghold in Shadowmoon Valley.
Though it may end up hurting my business in the long run, you look the sort that dreams of flying his own mount through the skies, rather than being flown from place to place.
I understand the feeling completely.
You, my friend, need to head to Wildhammer Stronghold in the southwest corner of Shadowmoon Valley. When you get there, speak with Ilsa Blusterbrew about some flight instruction. Mind you, her training's not cheap. But, I think that you'll find it worth your while.