public async Task <IActionResult> Confirm(int relationshipId)
        {
            var userId = User.FindFirstValue(ClaimTypes.NameIdentifier);

            try
            {
                await relationshipService.ConfirmRequest(relationshipId, userId);

                return(Ok("Confirmed"));
            }
            catch (ItemNotFoundException e)
            {
                return(BadRequest(e.Message));
            }
        }