The biggest missing aspect of good

The biggest missing aspect of good librarianship at the information desk was follow up. I realize that it is rarely possible on a busy day to follow up in the proper sense -- finding the user again and asking if they found everything they were looking for and if they need any further assistance. But it can't be emphasized enough how much positive effect a "Don't hesitate to stop by again if you have any problems" or a "Please come back if you have any more questions" can have.