That was last year.
I asked a lounge agent at DFW about changing the PDX-LAX flight the following Sunday night. The agent entered the request in the system and called the ticket office, who then said it was subject to the change fee. I challenged it and ticketing wouldn't give more details to support their claim (even though I could easily pull up the fare rules). When I pushed back and said it was meant to be a free change, they didn't do it and the agent reverted the flights. But didn't do it right (kept the new flight in as pending) which then confused my travel agent when I pushed it back to her to sort out.

This time, I'm wanting to change AA8890 (CX691) [0810 HKG departure] to AA8899 (CX711) [1640 HKG departure] on the same date.
Just asked the LAX QF F lounge agent, who called the CX gate staff (closing out their lunch time LAX departure), who said to talk to AA...

Still have some time to make the change (~3 weeks). Lots of availability currently (D1 and D0 on the current morning flight codes, D9 and D7 on the afternoon flight codes).