Filling in for the day

I'm filling in as an assistant for someone as their regular assistant is in Vegas for a bachelor's party.  The weird part is calling people and saying, "I have_________ for you.  Please hold."  Also, answeing the phone is weird, because inevitably none of the calls are for me.  "________'s office. . .  may I ask who's calling?... please hold."  A lot of politely asking people to hold.