Opinion Poll Bot | Part 1 | Setup the Development Environment | Microsoft Bot Framework

// Register LUIS recognizer
services.AddSingleton<FlightBookingRecognizer>();
  
// Register the BookingDialog.
services.AddSingleton<BookingDialog>();

public class MainDialog : ComponentDialog
    {
        protected readonly ILogger Logger;
  
        // Dependency injection uses this constructor to instantiate MainDialog
        public MainDialog(ILogger<MainDialog> logger)
            : base(nameof(MainDialog))
        {
            Logger = logger;
  
            AddDialog(new TextPrompt(nameof(TextPrompt)));
            AddDialog(new WaterfallDialog(nameof(WaterfallDialog), new WaterfallStep[]
            {
                IntroStepAsync,
                ActStepAsync,
                FinalStepAsync,
            }));
  
            // The initial child Dialog to run.
            InitialDialogId = nameof(WaterfallDialog);
        }
  
        private async Task<DialogTurnResult> IntroStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
        {
             return null;
        }
  
        private async Task<DialogTurnResult> ActStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
        {
             return null;
        }
  
        private async Task<DialogTurnResult> FinalStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken)
        {
             // Restart the main dialog with a different message the second time around
            var promptMessage = "What else can I do for you?";
            return await stepContext.ReplaceDialogAsync(InitialDialogId, promptMessage, cancellationToken);
        }
    }