public ConferenceBuilder WithMessages(int numberOfMessages)
        {
            var messages = new Builder(_builderSettings).CreateListOfSize <InstantMessage>(numberOfMessages).All()
                           .WithFactory(() =>
                                        new InstantMessage("Username", "Test InstantMessage", "ReceiverUsername")).Build();

            foreach (var message in messages)
            {
                _conference.AddInstantMessage(message.From, message.MessageText, message.To);
            }

            return(this);
        }