What the hell else do you call the desk where you go for help?
Does going into an establishment with the intent of using their services not make one a customer?
I'd think being thought of as a "customer" - whose involvement with a given establishment is voluntary and contingent on good service - would be preferable to them simply seeing you as a taxpayer who has to support the library whether they like it or not and thus they really don't care if you're "satisfied" or not.
"Information"
or
"Help"
or
Library Services
or
"Twee, get help"
And I realize I forgot the D... but then I thought it was better to just leave it off.