I just wanted to retime my flight so I'd have longer in SYD - options are never given when booking online for longer transits through SYD. I called the Marco Polo line and was transferred to reservations and neither said they could help me. Would trying the Cantonese line to get someone from HK really make a difference in this situation?

I'll try to fix it during my layover at HKG anyway so it doesn't matter too much.. Just for future reference.