question

protected override async Task OnMessageActivityAsync(ITurnContext<IMessageActivity> turnContext, CancellationToken cancellationToken)
{
if(turnContext!=null)
{
var options = new QnAMakerOptions();
// The actual call to the QnA Maker service.
var replyActivity = await Services.QnAMakerService.GetAnswersAsync(turnContext, options);
if (turnContext.Activity.Type == ActivityTypes.Message)
{
if (replyActivity != null)
{
await turnContext.SendActivityAsync(MessageFactory.Text(replyActivity[0].Answer), cancellationToken);
}
else
{
await turnContext.SendActivityAsync(MessageFactory.Text("No answers were found."), cancellationToken);
}
}

         // Run the Dialog with the new message Activity.
         await Dialog.RunAsync(turnContext, ConversationState.CreateProperty<DialogState>(nameof(DialogState)), cancellationToken);
         // Replace with your own condition for bot escalation
             if (turnContext.Activity.Text.Equals("escalate", StringComparison.InvariantCultureIgnoreCase))
             {
                 Dictionary<string, object> contextVars = new Dictionary<string, object>() { { "BotHandoffTopic", "escalate" } };
                 OmnichannelBotClient.AddEscalationContext(replyActivity[0].Activity, contextVars);
             }
             // Replace with your own condition for bot end conversation
             else if (turnContext.Activity.Text.Equals("endconversation", StringComparison.InvariantCultureIgnoreCase))
             {
                  Dictionary<string, object> contextVars = new Dictionary<string, object>() { { "BotHandoffTopic", "endconversation" } };
                 OmnichannelBotClient.AddEndConversationContext(replyActivity[0].Answer);
             }
             // Call method BridgeBotMessage for every response that needs to be delivered to the customer.
             else
             {
                 OmnichannelBotClient.BridgeBotMessage(replyActivity[0].Answer);
             }

             await turnContext.SendActivityAsync(MessageFactory.Text(replyActivity[0].Answer), cancellationToken);
         }
     }