I am trying to exchange a CO ticket. Called reservation line, went through the process of setting up the new flights but original ticket shows no-show even though I absolutely called in advance to cancel. So agent says she needs to contact a supervisor. I wait... and wait... every 10 minutes or so she comes on the line to ask if I want to continue to hold, which I stupidly continue to do expecting that it has to end at some point and why would I want to start over with a new agent and a new wait (not to mention potentially lose the flights I want to rebook). After 85 minutes, the agent comes back to tell me that she's still unable to reach a supervisor but would see if she could clear the "no-show" herself. Miraculously she is now able to do this. Sadly, it does not end there. She then quotes the fare for the new flights as over $1,000 more than the fare I had found online. These are all UA flights, we go over them one by one and they are all correct but she is showing no W inventory on the outbound flights while I am seeing W9. I check on co.com and it too cannot price the UA flights as expected. While still on the line, I go to UA.com and do a dummy booking and it prices exactly as I expected. Nothing the agent can do about this. So after 100 minutes of CO incompetence and with none of that cross-carrier integration in place, I go back to UA and shell out full price again, saving the unused ticket for another time where I look forward to more hours of CO phone hell. At least I'm finally able to go to bed at 2 am. Thanks CO.