flight changes

[hamish1966]

my flight has been cancelled from manchester to dalaman 29 th
21 hrs my travel agent has put us on a flight 5 hrs earlyer and i cant make it because of work what can i do and what is the travel agents angle we only have three weeks to go but absoluty cannot go early to be honest i was going to have to drive like a loonie to get to the flight that was previously booked the dog kennels are booked car parked booked all the plans were in place now they change it three weeks to go im mad as hell can anyne advise.