answer: Mary invites John to her home for dinner. But then John finds the fact is that Mary wants John to help her with her science project. So John makes an excuse and declines her invitation.
documents: #Person1#: Hi, John. What are your plans for the weekend?
  #Person2#: Huh? My plans? Nothing really. Probably read some books or play on my computer. Why?
  #Person1#: Well, I want to invite you to my home for dinner. So we can get to know each other better.
  #Person2#: You want to invite me to dinner? But we've been in the same class for the past 2 years and you've never even spoken to me before.
  #Person1#: Yes, I know. We seldom have the chance to talk. I'm always playing with my friends and having fun, while you always have your face in a book.
  #Person2#: Yeah. Well, I guess I can come. Thanks. Actually, I do feel like relaxing. I have been working all week on science project.
  #Person1#: Really? I haven't even started it yet. Science is so boring.
  #Person2#: You haven't started it yet? Listen, maybe you should spend this weekend doing the project. It really is a lot of work. We can have dinner next weekend.
  #Person1#: No, no. It has to be this weekend. Hey, I know, you're good at science and have already done the project. So after dinner, maybe you can do my project.
  #Person2#: Do your project?
  #Person1#: I... I mean, help me do my project. Just bring your books and the project plan. It shouldn't take you...Ah... I mean us, long to finish.
  #Person2#: Us? Yeah, I see. Listen, Mary, I've just remembered. I'm busy this weekend, so I won't be able to make it to dinner.