在出现“ x”个问题之后，如何通过内联编辑器使用Dialogflow的默认后备意图关闭对话？

如何解决在出现“ x”个问题之后，如何通过内联编辑器使用Dialogflow的默认后备意图关闭对话？

我需要实现一个功能，在定义的失败次数达到一定次数后，该功能将关闭与由 Dialogflow 管理的漫游器的对话：我的意思是，当用户反复询问未涉及的主题时。 AFAIK，这可以通过在所谓的 Default Fallback Intent 中添加一个Webhook来完成，在我们的设置中，只能使用 Inline Editor 来完成。我已经在网上找到了一些信息，但是显然the official documentation已有两三年没有更新了。

Google达到此目标的主要参考文献似乎也已过时。内托·马林（Neto Marin）于2018年10月30日写道a solution that just works，或者最好是在那时就可以工作。我按原样尝试了以下代码，但由于 Dialogflow ES 控制台中的调试错误说明不当而失败，

'use strict';

const { dialogflow } = require('actions-on-google');
const functions = require('firebase-functions');
const app = dialogflow({ debug: true });

app.intent('Default Fallback Intent',(conv) => {
  const ticketCount = 17;

  if (!conv.data.fallbackCount) {
    conv.data.fallbackCount = 0;
  }
  conv.data.fallbackCount++;

  if (conv.data.fallbackCount === 1) {
    return conv.ask('Sorry,how many was that?');
  } else if (conv.data.fallbackCount === 2) {
    return conv.ask('Sorry,I didn’t get it. How many tickets would you like to purchase?');  
  } else {
    return conv.close(`This seems like beyond my expertise. Let’s stop here. There are currently ${ticketCount} seats available. Bye for Now.`);
  }
});

exports.dialogflowFirebaseFulfillment = functions.https.onRequest(app);

因此，经过长时间的研究，我发现上面的代码中我试图一一解决的问题：例如，conv应该是agent.conv()的实例从 Dialogflow V2 等开始，甚至此后的调试激活也发生了变化。我尝试了以下根据Neto改编的解决方案：

'use strict';

const functions = require('firebase-functions');
const { WebhookClient } = require('dialogflow-fulfillment');

process.env.DEBUG = 'dialogflow:debug';

exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request,response) => {
  const agent = new WebhookClient({ request,response });

  function fallback(agent) {
    let conv = agent.conv();

    const ticketCount = 17;
    if (!conv.data.fallbackCount) {
      conv.data.fallbackCount = 0;
    }
    conv.data.fallbackCount++;

    if (conv.data.fallbackCount === 1) {
      return conv.ask('Sorry,how many was that?');
    } else if (conv.data.fallbackCount === 2) {
      return conv.ask('Sorry,I didn’t get it. How many tickets would you like to purchase?');  
    } else {
      return conv.close(`This seems like beyond my expertise. Let’s stop here. There are currently ${ticketCount} seats available. Bye for Now.`);
    }

    agent.add(conv);
  }

  let intentMap = new Map();
  intentMap.set('Default Fallback Intent',fallback);

  agent.handleRequest(intentMap);
});

这更接近解决方案，但是我在GitHub上发现了a closed issue，似乎只有依赖关系更新才可以提供帮助。然后，我在package.json上进行了相应的更改：

  "dependencies": {
    "actions-on-google": "^2.2.0","firebase-admin": "^5.13.1","firebase-functions": "^2.0.2","dialogflow": "^0.6.0","dialogflow-fulfillment": "^0.6.1"
  }

我不得不从0.5.0软件包的0.6.1版本切换到dialogflow-fulfillment，但是现在我在诊断信息中得到了Webhook call Failed. Error: UNAVAILABLE.。还有一件事…我尝试将the end conversation flag从意图本身打开和关闭，但没有任何改变。