You're story is odd. You were just fired and have no clue why? Not even an idea? The standard advice applies here - take a set back and turn it into a positive. Do not hide anything; own it, learn and grow from it, and be prepared to openly and comfortably discuss it in future interviews. The first step in being able to use this advice, however, is knowing and understanding why you were terminated. Who actually told you you were being released from training? Did you ask for the reason? Did you talk to the head of your training department? Seems odd, especially in today's regional environment, that you were let go on a whim...