To be honest, it wasn't until a friend informed me that I knew Allegiant even had an office in Denver. I'm so happy I learned! Trying to modify my flight online had been difficult for me, and the system kept breaking. I thought there would be a lengthy wait when I walked into the office, but I was wrong. In five minutes, I received assistance. The man at the desk was kind, understanding, and well-versed in the change policy. Despite being a large airline, there was a sense of local business. This office is a wonderful little secret to have in your back pocket if you're flying Allegiant out of Denver.