This is probably too late for you marisogno but yes, we were able to go to Tashkent airport on the day we wanted to fly and purchase 2 tickets to Urgench. We asked at the ticket purchase counters if anyone spoke English and the counter person walked straight over to the 'terminal manager'. She came to speak with us and was friendly - at first she said, no this will not be possible, but then we explained that we'd spoken with someone at Uzbek Airways the day before. This airline representative told us that we might be able to purchase seats if there were no-shows. So the terminal manager listened to this and then said, if you wait until a half hour before the flight is due to depart, I'll update you. So after some nervous nail-biting, she walked over to us and gave us a little slip that must have said, sell these people 2 tickets, and I ran to the ticket counter with my dollars! Moment of euphoria!