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//start maps activity for beach selection
  val intent = Intent(this@ReservationActivity, MapsActivity::class.java)
  var b:Bundle = Bundle()
  b.putParcelable("Reservation", reservation)
  intent.putExtras(b)
  startActivityForResult(intent, 1)

lateinit var reservation: CustomerReservation

// inside onCreate method
val intentReceived = intent
val data = intentReceived.extras
if (data != null) {
  reservation = intent.getParcelableExtra("Reservation")
} else {

}