My gf sprained her ankle 2-3 months ago and just had the cast removed yesterday. We are flying to Hong Kong from Toronto in 2 days for her sister's wedding but she is very worried that she will be very uncomfortable sitting in economy class for a long period of time. Called cathay and asked if we can move her to one of the seats in front of the plane and near the door but they said no.

Now I am not asking if it is possible for an free upgrade as i know its solely based on luck but is it possible to ask the lady at the ticket counter whether my girlfriend can get upgraded to business class for a reduced cost due to unforeseen circumstances? If he/she says yes then do you guys know how much will it cost me to upgrade her to business class?

Just as an FYI we bought the two tickets through her dad as his employers has certain perks like discounted plane tickets and as a result. Not sure if this matters as well but her dad has an Asia Miles card and travels almost twice a year between toronto and hong kong.