I booked a reservation at the LAS ticket counter using a $500.00 travel voucher on the same airline that issued me the travel voucher. I was issued an e-ticket. The fare was 435 (coast to coast). I was issued a 65 dollar travel voucher for the difference between the value of the voucher vs. the cost of the ticket. Plans changed and I returned to the LAS ticket counter and paid a 100 penalty to change the routing. I cancelled the original reservation and used the remaining "credit of 345 towards a different fare to a different city. I thought was the end of the transaction... I received a call from the airline advising me of a major schedule change to the original fare that I purchased. I thought that once I changed the fare and used the money left over after the penalty towards a different fare that this reservation would go away. Obviously the carrier made a mistake. I returned the call to the carrier wherein they advised of a new schedule and I played along. After receiving the new schedule, I was told that I would have to get the ticket "reissued". I was put on hold twice and I thought that I would "get caught" (a free ticket was worth a try? they called me...) The csr said..."we cannot find a history on this ticket (or something to that effect). I said that I did make some changes and was not totally clear on what changes that I had made. One last long hold period and I was told that everything was ok and they dumped the old file contents and updated my record locator. I was told that I would have to go to a ticket counter/city ticket office to be reticketed. I went to the LAS ticket counter and provided the record locator to the agent and was given an eticket. I looked on the carrier's web page and I am listed as confirmed with seats assigned. Will this work... have they made an undetectable mistake. What will happen when I go to get boarding passes, where will the amount of the fare be listed if I did not pay? Any thoughts on this? Want any thoughts on my success before I book hotel/car reservations.