"Hot air" joke

A man flying in a hot air balloon realizes he is lost. Spotting a man down below, he reduces height 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 work in engineering!' says the balloonist.' I do,' replies the man.' How did you know?'

'Because,' says the balloonist,' everything you have told me is technically correct, but it's of no use to anyone.'

'You, my friend,' says the man below,' must work in management.'

'I do' replies the balloonist,' but how did you know?'

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