Booking.com Flight Schedule Change: Full Refund for Delta Ticket

I booked a Delta flight through Booking.com for travel on 1 August 2026 under the reservation number 3847261950. About ten days ago, I was informed that there was a schedule change on this flight. This schedule change is not suitable for me and I therefore do not wish to travel under the new conditions. I would like a full refund of the ticket price, without any penalties or additional deductions, since the change was initiated by the airline and not by me. I request that my reservation be reviewed urgently and that my refund be processed to my original payment method as soon as possible, and that I be informed in writing once this is completed.