Get available People for a Message

{
  "people": [
    {
      "avatarUrl": "r.jpg",
      "isAdministrator": false,
      "roleIds": [],
      "companyName": "Teamwork.com",
      "isResponsible": false,
      "isUnsubscribed": false,
      "isInOwnerCompany": true,
      "isFollowingComments": false,
      "firstName": "Holly",
      "isProjectAdministrator": true,
      "isObserving": false,
      "isInNotifyDefaults": false,
      "isInPrivacy": false,
      "id": "1",
      "doesReceiveProjectEmails": true,
      "companyId": "1",
      "isFollowingChanges": false,
      "title": "Product lead",
      "lastName": "McGill"
    }
  ]
}