answer: Helen will help to take Mike's paper to Professor Yang in Washington and ask Yang to point out the mistakes.
documents: #Person1#: Mike, I'm going to Washington tomorrow, do you have anything to be taken to professor Yang?
  #Person2#: Yes, Helen. I finished the article, if you will take it to him that will save me a trip.
  #Person1#: I'm glad to.
  #Person2#: Please ask him to read the article and point out any mistakes and I will try to correct them when I take it back.
  #Person1#: Have you printed it out?
  #Person2#: Not yet. Someone else is using the machine.
  #Person1#: Then can you print it before 4:50?
  #Person2#: Sure, I will take it to your office.