private async Task <DialogTurnResult> PromptStepAsync(WaterfallStepContext stepContext, CancellationToken cancellationToken) { var msg = CardBuilder.BuildOptionPrompt(_welcomeText, new CardBuilder.PromptOption("Login", "Login")).ToActivity(stepContext.Context); await stepContext.Context.SendActivityAsync(msg); return(new DialogTurnResult(DialogTurnStatus.Waiting)); }