Why is there a thread about this subject? WHY don't you just tell why you want be a pilot, instead of saying what you think they'd like to hear.
When I've got that question I've looked into my heart, why am I at that interview? it's a privilege to be at an interview for a job you love.
Come on people, don't anyone else about a question such this, they want to hear your story, not someone else story you've got from a forum.