Manage a long-running operation How-To

I have one solution, but I don't know if it is the correct approach: if I add an override of OnMessageActivityAsync(), I can then trigger the dialog:

protected override async Task OnMessageActivityAsync(ITurnContext<IMessageActivity> turnContext, CancellationToken cancellationToken)
{
Logger.LogInformation("Running dialog with Message Activity.");

// Run the Dialog with the new message Activity.
await Dialog.RunAsync(turnContext, ConversationState.CreateProperty<DialogState>(nameof(DialogState)), cancellationToken);
}

I'm guessing this wasn't the solution intended by the author of the How-To, since they don't include that override in the example code, but at least it moves me forward for now...