I don't want to update the value in into database but its getting updated in dot NETCore

I dont want to update value booking.Price in database (Postgrsql) but it is getting updated.I have following code

     .........
    public async Task<AppResponse<UpdateBookingCommandResponse>> Handle(UpdateBookingCommand request, CancellationToken cancellationToken){
   var booking = await _bookingRepository.GetByGuIdAsync(request.Id);
   booking.Price = request.Price;
   var response = _mapper.Map<UpdateBookingCommandResponse>(booking);
   return Ok(response);
}
...........

Request body

    public class UpdateBookingCommand : AppRequest<UpdateBookingCommandResponse>, IAuditableRequest
 {
 .......
 public List<Product> Products { get; set; }
 public List<Location> PickupLocations { get; set; }
 public decimal OriginalPrice { get; set; }
 public decimal Price { get; set; }
 public decimal Cost { get; set; }
 .....
}

Response Body

public class UpdateBookingCommandResponse
{
  .........
 public decimal OriginalPrice { get; set; }
 public decimal Price { get; set; }
 public decimal Cost { get; set; }
 public decimal PaidAmount { get; set; }
 ......
 }

Booking Class

public class Booking : BaseEntity
{
  ......
 public decimal OriginalPrice { get; set; }
 public decimal PriceCore { get; set; }
 public decimal Price { get; set; }
 public decimal PriceGst { get; set; }   
 .......
 }