The fields date_from and date_upto could be accessed with a simple self.browse(). For a function field the argument list should be like this: (self, cr, uid, ids, field_name, arg, context=None) Just make a check and if the dates are not filled in return an empty selection. This will happen when the form is loaded and a dates are empty. Then you could call _get_available_conference_halls with an on_change in the view to refill the selection when the dates are changed.
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