Bot Framework, conversation in another conversation

I created a bot using QnA Maker, which depending on the answer I should return the same answer or call another service, which in my case is to assemble a form flow from a JSON.

But when calling this service I start a new Conversation, so it does not return to the emulator.

I'm creating a conversation in another conversation. There must be something missing.

RootDialog.cs:

[Serializable]
public class RootDialog : QnAMakerDialog
{
    public RootDialog() : base(
        new QnAMakerService(
            new QnAMakerAttribute(
                ConfigurationManager.AppSettings["QnaSubscriptionKey"],
                ConfigurationManager.AppSettings["QnaKnowledgebaseId"],
                "Não encontrei sua resposta",
                0.5
                )
            )
        )
    {

    }

    protected override async Task RespondFromQnAMakerResultAsync(IDialogContext context, IMessageActivity message, QnAMakerResults result)
    {
        var primeiraResposta = result.Answers.First().Answer;

        if (primeiraResposta.IndexOf("form") == -1)
        {
            await context.PostAsync(primeiraResposta);
            return;
        }

        await Conversation.SendAsync(message, () => Chain.From(() => FormDialog.FromForm(() => Formulario.JsonForm.BuildJsonForm(), FormOptions.PromptFieldsWithValues)));

        return;

    }
}

MessagesController.cs

public async Task<HttpResponseMessage> Post([FromBody]Activity activity)
{
    var connector = new ConnectorClient(new Uri(activity.ServiceUrl));

    if (activity.Type == ActivityTypes.ConversationUpdate)
    {
        if (activity.MembersAdded.Any(o => o.Id == activity.Recipient.Id))
        {
            var reply = activity.CreateReply();
            reply.Text = "Hello...";
            await connector.Conversations.ReplyToActivityAsync(reply);
        }

    }
    else if (activity.Type == ActivityTypes.Message)
    {
        // HEREE!!!
        await Conversation.SendAsync(activity, () => new Dialogs.RootDialog());

    }
    else
    {
        HandleSystemMessage(activity);
    }
    var response = Request.CreateResponse(HttpStatusCode.OK);
    return response;
}

The response of emulator:

I could not send, Repeat

Copyright Notice：Content Author:「Romário Carvalho」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/49191894/bot-framework-conversation-in-another-conversation