answer: #Person1# buys four pounds of the extra-lean ground beef with #Person2#'s assistance.
documents: #Person1#: I would like to buy some beef.
  #Person2#: What kind do you want?
  #Person1#: I need to get ground beef.
  #Person2#: How many pounds would you like me to get you?
  #Person1#: I need about four pounds.
  #Person2#: Exactly what type of ground beef do you want?
  #Person1#: Extra lean.
  #Person2#: I'll get that for you right now.
  #Person1#: I appreciate that.
  #Person2#: Don't mention it, I'll just wrap this up for you.
  #Person1#: Thanks for your help.