answer: #Person1# books two tickets to Paris one month before the actual 10th wedding anniversary, because #Person1# misremembers the wedding date. #Person2# helps #Person1# to refresh the memory and decides to celebrate beforehand.
documents: #Person1#: Honey, I have something important to say.
  #Person2#: Something important?
  #Person1#: Yes. I have just booked two tickets.
  #Person2#: Tickets? What tickets?
  #Person1#: Two air tickets.
  #Person2#: Air tickets?
  #Person1#: Yes. We will fly to Paris the day after tomorrow.
  #Person2#: We? The day after tomorrow? What are you talking about?
  #Person1#: Today is June 18, isn ' t it?
  #Person2#: Yes. So?
  #Person1#: Think about it!
  #Person2#: Then it is June 20 the day after tomorrow.
  #Person1#: Yes. Think about it carefully.
  #Person2#: Oh, come on. Tell me please. Why did you book tickets to Paris?
  #Person1#: Oh, honey! Don ' t you remember this important day to us?
  #Person2#: Sorry.
  #Person1#: It is our 10th wedding anniversary this June 20.
  #Person2#: Our 10th wedding anniversary?
  #Person1#: Of course. You completely forgot it.
  #Person2#: Darling. I think you have made a mistake.
  #Person1#: I have made a mistake?
  #Person2#: Yes. We married on July 20 ten years ago.
  #Person1#: July 20? But I think it should be June 20.
  #Person2#: Yes. We had planned to marry on June 20, but something happened, so we had to put off our wedding day.
  #Person1#: Yes. I remember now. We put it off. I did make a mistake. But how shall we deal with the tickets?
  #Person2#: Since you have booked. Then let ' s celebrate our wedding anniversary before hand.