Error: 'hotel.reservation' object has no attribute 'checkin'<br><pre>Traceback (most recent call last):
  File "/home/odoo/src/user/online_hotel/controllers/hotel_search.py", line 217, in debug_availability
    html_response += f"<li>Reservation {reservation.reservation_no}: {reservation.checkin} to {reservation.checkout} (State: {reservation.state})</li>"
                                                                      ^^^^^^^^^^^^^^^^^^^
AttributeError: 'hotel.reservation' object has no attribute 'checkin'
</pre>