answer: Nick asks Polly to arrange Ms. Kelly's lecture. Polly suggests using her class on Tuesday. Nick'll speak to Dr. Lee about that and asks Polly to talk to the students.
documents: #Person1#: Polly, Ms. Kelly has agreed to come and give a talk about international relations next week. When do you think we can fit her lecture in?
  #Person2#: That's Great, Nick. What about Friday afternoon then?
  #Person1#: I'm afraid some students are planning to go on a trip. Maybe we can have it on Wednesday afternoon.
  #Person2#: No, that's not possible, either. Most students are having group activities for their research projects. Well, I have an idea. I have a class on Tuesday afternoon and probably Ms. Kelly can use my time.
  #Person1#: That's possible, but I have to speak to Dr. Lee about that. And you should also talk to the students about the change.
  #Person2#: Oh, yes, I'll certainly do that.