As
@MEL_Traveller it is most likely married flights, I went through the same thing for my booking. I wanted HND-DXB-LHR as my wife and daughter would be arriving a couple of hours later on QR, not that that matters. The agent informed me She could only book HND-DXB-LGW so I went with that option. As soon as it was ticketed I called back (within the 24 hour change window) and ask if I could change to LHR and the answer was yes. I am now flying into LHR and as the change was made within the 24 hour time frame there were no points change fees, just a few bucks in taxes. MMYV and I don't think there is anything you can tell the agent unless you can get through to Hobart, the stories spun by agents in other call centers can vary depending on the agent. I find it very frustrating as I spent a number of years as WP and 10 years as P1, now I am back to gold some of the things the agents tell me 'is not possible' is just not correct as I used to be able to book the same thing when I was WP and P1. IMO it just comes down to how well the agent is trained.