code: def request_data(cls, time, site_id, **kwargs):
          
          endpoint = cls()
          df = endpoint._get_data(time, site_id, None, **kwargs)
          return df
docs: Retrieve upper air observations from Iowa State's archive for a single station.
  
          Parameters
          ----------
          time : datetime
              The date and time of the desired observation.
  
          site_id : str
              The three letter ICAO identifier of the station for which data should be
              downloaded.
  
          kwargs
              Arbitrary keyword arguments to use to initialize source
  
          Returns
          -------
              :class:`pandas.DataFrame` containing the data