'startTimeOfNextBooking' => 'string:datetime', // The start time of the next booking. null if there are no bookings starting after 'now'. [read-only],
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'startTimeOfPreviousBooking' => 'string:datetime', // The start time of the last booking that occurred before 'now'. It is updated only after that booking's stop time [read-only],
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'dateOfBirth' => 'string:date',
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'customFields' => 'Array[CustomField]',
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'gender' => 'string', // The gender of this person. = ['male' or 'female' or 'unknown'],
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'customerId' => 'string', // The id of the customer to whom this person is linked. [read-only]