public DateTime At {  get; }
    public  string Email {  get; }
    public  string Name {  get; }
    public  int Quantity {  get; }

    public override bool Equals( object? obj)
    {
        return obj  is Reservation reservation &&
               At == reservation.At &&
               Email == reservation.Email &&
               Name == reservation.Name &&
               Quantity == reservation.Quantity;
    }

    public override int GetHashCode()
    {
        return HashCode.Combine(At, Email, Name, Quantity);
    }
}