I am trying to book an award ticket on SA. It shows available on ANA, as well as CO website (if I do not log in). However, some cabins available before are no longer available after I log in. What is worse, phone agent could not see the daily flight at all on a particular day, although it shows up around that day.

Phone agent keeps claiming they could not do anything if it does not show up in their system (even though it shows up on CO website!). I am so frustrated. What's the problem? Any ideas?

Thanks a lot!