There was another complicating factor: The first leg of your ticket was not on Aer Lingus, but on Emerald Airlines, a code-share partner. And according to Aer Lingus, you didn't have a connecting flight to Boston on your itinerary. It's unclear how that could have happened. —But when you didn't make it to Dublin for your flight to Boston, Aer Lingus considered you a "no show" and canceled your reservation.