Half way flying to Sydney got an sms saying my return 10.00 pm flight had been cancelled - don't know why. On arrival after finally finding someone to talk to was told they had put me on a 8.00 pm flight back to Melbourne - the only problem was that was when i was at a forum in town as a speaker. Then told no flights available that night as all Qantas flights after 7.30 had been cancelled. Again, don't know why - did this happen to anyone else? PS on the flight to Sydney told not enough food for everyone and the plane left 30 minutes late.