Appointment confirmation

confirmAppointment.js

exports.dialogflowFirebaseFulfillment = functions.https.onRequest((request, response) => {
  const agent = new WebhookClient({ request, response });
  function confirmAppointment(agent) {
    const dateTimeStart = new Date(
      Date.parse(agent.parameters.date.split('T')[0] + 'T' + agent.parameters.time.split('T')[1])
    );
    const appointmentTimeString = dateTimeStart.toLocaleString(
      'en-US',
      { weekday: 'short', day: 'numeric', month: 'short', hour: 'numeric', minute: 'numeric', timeZone: 'Asia/Bangkok' }
    );
    return agent.add(`ยืนยันนัด ` + appointmentTimeString + ` ไหมครับ?`);
  }

  let intentMap = new Map();
  intentMap.set('Appointment', confirmAppointment);
  agent.handleRequest(intentMap);
});