Incidentally, the "not important" bit comes from Slartibartfast's first exchange with Arthur, where he reveals his name.
Arthur Dent: Excuse me, what is your name by the way?
Slartibartfast: My name?
Slartibartfast: My name is Slartibartfast.
Arthur Dent: I beg your pardon?
Arthur Dent: Slartibartfast!?!
Slartibartfast: I told you it wasn't important.