public IHttpActionResult RejectSession(SessionApprovalModel model)
 {
     try
     {
         _sessionService.Reject(model, User.Identity.Name);
         return Ok();
     }
     catch (Exception)
     {
         return BadRequest();
     }
 }
 public async Task<IHttpActionResult> ApproveSession(SessionApprovalModel model)
 {
     try
     {
         var username = _sessionService.Approve(model, User.Identity.Name);
         return Ok();
     }
     catch (EdLightException ex)
     {
         return BadRequest(ex.Message);
     }
     catch (Exception)
     {
         return BadRequest();
     }
 }