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));
}