I did this on our current booking and it worked fine. I knew exactly which cabin I wanted to switch to, it was in the same category and there was no price difference. The call center rep was able to easily make the change for me and I got the confirmation immediately. The call rep did have an accent and there was a little background noise but he seemed very eager to help. What I did NOT like was the brief survey I took at the end of the call. I was happy with the interaction and gave the rep 5’s but the last question was really odd. It was something like “ If you were a business owner, would you hire the person who helped you okay?” Or something to that effect. What the heck kind of question is that?