RootDialog.cs

namespace SkypeChatBot.Dialogs
{
    using System;
    using System.Threading.Tasks;
    using System.Text;
    using Microsoft.Bot.Builder.Dialogs;
    using Microsoft.Bot.Connector;

#pragma warning disable 1998

    [Serializable]
    public class RootDialog : IDialog<object>
    {

        private string question = null;

        public async Task StartAsync(IDialogContext context)
        {
            context.Wait(this.MessageReceivedAsync);
        }

        private async Task MessageReceivedAsync(IDialogContext context, IAwaitable<IMessageActivity> result)
        {
            var message = await result;

            if (this.question == null)
            {
                await this.SendWelcomeMessageAsync(context);
            }
            else
            {
                context.Wait(this.MessageReceivedAsync);
            }
        }

        private async Task SendWelcomeMessageAsync(IDialogContext context)
        {
            context.Call(new WelcomeDialog(), this.WelcomeDialogResumeAfter);
        }

        private async Task WelcomeDialogResumeAfter(IDialogContext context, IAwaitable<string> result)
        {
            try
            {
                this.question = await result;

                StringBuilder strReplyMessage = new StringBuilder();
                strReplyMessage.Append($"Thank you, we are searching for a community volunteer to help.");
                strReplyMessage.Append($"\n");
                strReplyMessage.Append($"Please standby.");

                await context.PostAsync(strReplyMessage.ToString());
                //context.Call(new AgeDialog(this.name), this.AgeDialogResumeAfter);
            }
            catch (TooManyAttemptsException)
            {
                await context.PostAsync("I'm sorry, I'm having issues understanding you. Let's try again.");

                context.Call(new WelcomeDialog(), this.WelcomeDialogResumeAfter);
            }
        }
    }
}