Air Asia — rescheduling of flight

I had booked my ticket i5-722 from bangalore to delhi which was supposed to depart at 21:10 and land at 23:50. But i received notification that departure time has been changed to 23:25 and landing time to 02:10 am.
I had booked this flight according to my successive commitments which are clashing with the time. The reason they have mentioned is winter. So that reason must be prevalent at the time they declared this flight.
People book flights according to the time so that they can match their plan according to that. Now i have to catch another flight after this.
Please provide me with an alternative for this