Ranjha.....
Ranjha, I wish you all the very best of luck with your interview.
Given my circumstances, I may not be the best person to offer you advise but I would encourage you to learn as much about the airline and how to care best for their customers as possible. Think about how you would be an asset to the company.
I may not ever know why I was given the flick, I have previous experience and am about as dedicated as you can get, but I guess they had they're reasons.
Once again best of luck.