public IEnumerable <CallQueueCustomer> GetCallQueueCustomers(long callQueueId, int noOfDays)
        {
            var eventIdCustomerIdPairs = _eventCustomerRepository.GetCustomerForConfirmationCallQueue(noOfDays);

            if (eventIdCustomerIdPairs == null || !eventIdCustomerIdPairs.Any())
            {
                return(null);
            }

            var callQueueCustomerList = new List <CallQueueCustomer>();

            foreach (var eventIdCustomerIdPair in eventIdCustomerIdPairs)
            {
                callQueueCustomerList.Add(new CallQueueCustomer {
                    CallQueueId = callQueueId, CustomerId = eventIdCustomerIdPair.SecondValue, EventId = eventIdCustomerIdPair.FirstValue
                });
            }

            return(callQueueCustomerList);
        }