Translation of aufbacken

The connecting flight to Phuket was fully booked, and the connection to Krabi had five empty seats. The problem was that the boarding began in ten minutes and I did not even have a ticket.
In South American we speak normal Spanish, but sometimes it sounds like music and not as you are used to it from the school books and video tutorials from the language schools that you have learned in Guatemala.
What are you doing? I'm at work. It is so boring and my boss is not here. Yesterday I was here until midnight, because we had problems with the PC system. Then we ordered pizza and a few beers.