Shade Tree Mechanic

A shade tree mechanic is flying a hot air balloon and realizes he is lost. He reduces height and spots a man down below. He lowers the balloon further and shouts, "Excuse me, can you tell me where I am?"

The man below says, "Yes, you're in a hot air balloon, hovering 30 feet above this field. "

"You must be an engineer", says the shade tree mechanic.

"I am", replies the man. "How did you know?"

"Well", says the shade tree mechanic, "everything you have told me is technically correct, but it's of no use to anyone."

The man below says, "You must be a shade tree mechanic ."

"I am", replies the shade tree mechanic, "but how did you know?"

"Well", says the man, "you don't know where you are, or where you're going, but you expect me to be able to help. You're in the same position you were before we met, but now it's my fault. "