firstLUISdialog.cs

[BotAuthentication]
public class MessagesController : ApiController
{
    public async Task<Message> Post([FromBody] Message message)
    {
        return await Conversation.SendAsync(message, () => new DocAssistDialog());
    }
}

[LuisModel("nope", "nope")]
[Serializable]
public class DocAssistDialog : LuisDialog<object>
{
    [LuisIntent("")]
    public async Task None(IDialogContext context, LuisResult result)
    {
        var message = $"Sorry I did not understand: " + string.Join(", ", result.Intents.Select(i => i.Intent));
        await context.PostAsync(message);
        context.Wait(MessageReceived);
    }
}