answer: Zina asks Dave who left the note on her desk, but Dave doesn't know.
documents: #Person1#: Dave, wake up. 
  #Person2#: Whaah? Zina? What time is it? 
  #Person1#: It's seven-thirty. I want to know who left this note on my desk. 
  #Person2#: What note? I can't see. I just pulled an all-nighter. 
  #Person1#: It's a little green post-it note, stuck right in the middle of my computer screen. 
  #Person2#: And? What does it say? Isn't there a name? 
  #Person1#: It says, Zina, I like how you rhumba. An admirer.