If you have a trial date and the officer doesn't show up, the ticket should be dismissed, especially if the troopers prosecute in the town in which you were speeding. If there is a prosecutor, the judge may, but not always, adjourn the case; but usually the ticket is dismissed.
What town was the ticket issued in? 31 mph over is a big ticket in NY. Do you have any points now or existing moving violations on your record (w/in the last 3 years). I am an attorney in upstate NY.
In the past I have successfully used the delay tactic many times. I usually ask for 2 adjournments and by that time the officer's schedule usually doesn't coincide with the courts, but not always.