First improvement

first-improvement.js

// Replace the line 252 to 316 by this
if (messageText) {

      const greeting = new RegExp(/^(kaiz|kez|slt|salut|bjr|bonjour|hi|hello|hey|hola)/i)

      if (messageText.match(greeting)) {
        sayHello(senderID)
      } else if (messageText.match('image')) {
        sendImageMessage(senderID)
      } else if (messageText.match('gif')) {
        sendGifMessage(senderID)
      } else if (messageText.match('audio')) {
        sendAudioMessage(senderID)
      } else if (messageText.match('video')) {
        sendVideoMessage(senderID)
      } else if (messageText.match('file')) {
        sendFileMessage(senderID)
      } else if (messageText.match('button')) {
        sendButtonMessage(senderID)
      } else if (messageText.match('generic')) {
        sendGenericMessage(senderID)
      } else if (messageText.match('receipt')) {
        sendReceiptMessage(senderID)
      } else if (messageText.match('quick reply')) {
        sendQuickReply(senderID)
      } else if (messageText.match('read receipt')) {
        sendReadReceipt(senderID)
      } else if (messageText.match('typing on')) {
        sendTypingOn(senderID)
      } else if (messageText.match('typing off')) {
        sendTypingOff(senderID)
      } else if (messageText.match('account linking')) {
        sendAccountLinking(senderID)
      } else {
        sendTextMessage(senderID, messageText)
      }
  } else if (messageAttachments) {
    sendTextMessage(senderID, "Message with attachment received")
  }
}

// and add this function to say hello with the first name
function sayHello(senderID) {
  request({
    uri: `https://graph.facebook.com/v2.11/${senderID}`,
    qs: { access_token: PAGE_ACCESS_TOKEN },
    method: 'GET',
    json: true
  }, function (error, response, body) {
    if (!error && response.statusCode == 200) {
      sendTextMessage(senderID, "Miarahaba an'i " + body.first_name)
    } else {
      console.log(error)
    }
  })
}