Apologies if this has been asked before. Doing a segment run and just boarded my outbound flight so don’t have time to search.

Prior to boarding I called the concierge desk and asked about making a same day change to my return flight. I’m currently scheduled to fly YVR-YEG on my last segment, but wanted to change it to YVR-YYC-YEG (booking via YYC In original booking would have blown my $/segment target). The change I asked for is a legal routing, but the cncierge told me segments can’t be added via SDC. Is the concierge I spoke to right, or should I try again at my destination?

I’m on a Flex fare and don’t mind paying SDC fee if it’ll get me the extra segment.