Is it possible to retrieve appointment responses from attendees?

Is it possible to retrieve the status of attendees in Outlook Web Add-In for an appointment/meeting? Here is a snippet similar to the code I'm working with.

let item = Office.context.mailbox.item,
  requiredAttendees, optionalAttendees, totalAttendees = 0;

if (item.itemType === Office.MailboxEnums.ItemType.Appointment) {
  requiredAttendees = item.requiredAttendees;
  optionalAttendees = item.optionalAttendees;

  if (requiredAttendees) {
    requiredAttendees.getAsync((asyncResult) => {
      console.log(asyncResult.value);
      if (asyncResult.status === Office.AsyncResultStatus.Succeeded) {
        totalAttendees += asyncResult.value.length;
        for (let i = 0; i < asyncResult.value.length; i++) {
          console.log(asyncResult.value[i].displayName + ' | ' +
            asyncResult.value[i].appointmentResponse + ' | ' +
            asyncResult.value[i].recipientType + ' | ' +
            asyncResult.value[i].emailAddress);
        }
      }
    });
  }
}

appointmentResponse is undefined.

I'm looking for something to indicate:

• No Response
• Accepted
• Declined