Air India Express — ref:refund of air ticket due to cancelled flight of covid 19 travel restriction

Dear sir,
Please refund my air ticket fee since the flight has been cancelled.
Booking ref: gceeaq
I have booked airticket on april, 2020 for the travel date of 4th may, 2020.
But flight has been cancelled due to covid 19 travel restrictions in india.
Hence as per government guidelines please refund the full amount asap since i have canceled the booking.
Or else issue a voucher to rebook on the next available schedule.