Both at the check-in & J lounge. I think its the psychology of not getting home earlier. I never seem to mind too much missing a connection or a delay. Its when you are late getting home that it hits a nerve. I guess that doesn't show up the airlines balance sheet.
While all checkin people can change flights if the fare allows changes on the day and that particular class is
available - they can't all override the system to change your V class fare if eg only Y, H etc is all that's left. Sometimes particularly in the afternoon when people are flying home it seems just about everyone wants to get an earlier flight. If there is a queue of people at checkin some staff may be relectant to try and get hold of someone on the phone who may be able to make that change if it's going to take awhile.
I'm sure we've all been in a queue & seen the checkin person on the phone trying to sort out a problem for a passenger. How do we feel about that? Frustrated maybe because we just want the passenger to move along so we can be served.
Same goes for asking for changes in the QP or J Lounge - staff are busy making announcements, checking pax's membership cards on entry, doing points upgrades so it may not always be practical for them to take time out to call City Flyer.
My suggestion would be:
Travelling without bags
If you are NB, PS or QP by all means checkin at the kiosk & if there is eg V class available on an earlier flight, the kiosk will automatically offer you the earlier flight during the checkin process if there are v class seats available. If you have already done OLCI you can still go up to a kiosk, scan your boarding pass, Qcard etc & click on the option "change a flight" which will display if you are on a changeable fare. If you are SG, WP, CL or in J & are using Premium Checkin in, ask the checkin agent if it's possible to change to an earlier flight.
If you get no joy with above options, just go directly to the CityFlyer Desk/Service Desk in the departures area as you want to speak to the people who are in charge or onbloading standbys & finalising the flight & ask the question there. At smaller ports you may need to speak to the checkin Supervisor or the Ticket Counter/Sales Desk.
Be specific about what you would like eg "I'm currently booked on QF553 to SYD but I was wondering if there are any seats left on QF549. I've got a changeable fare & I'm travelling with no bags."
If the flight you want is full they may leave you confirmed on the later flight but put you on 'commercial standby' for the earlier one in which you would know about 15 minutes before departure if you're on or not. Remember you can't do this if you have checked luggage. Altea onloads Commercial standby pax before any leisure staff travel pax.
Travelling with bags
Prior to checking in, go to the Sales Desk/Ticket Counter & ask as above eg "I'm currently booked on QF553 to SYD but I was wondering if there are any seats left on QF549 as I'm travelling on a changeable fare." Hopefully they will change you & give you a boarding pass so all you need to do now & drop off your bag in the usual manner.