answer: #Person2# tells #Person1# #Person2# didn't show up in the meeting because #Person2# worked overtime last night to doublecheck the accuracy of some statistics. So #Person2# is allowed to come an hour later. Then, #Person1# and #Person2# talk about overtime working.
documents: #Person1#: You didn't show up in the morning meeting. What's up?
  #Person2#: Well, I just came in. I worked overtime yesterday. Some statistics and very important documents seemed to be inaccurate. So I stayed to double check them. The boss was aware of my very late work of last night. So before he left office, he told me I could come one hour later this morning.
  #Person1#: But you still look a little bit tired. What time did you leave?
  #Person2#: It was around 1 thirty in the morning. I guess I didn't fall asleep till 3 because those numbers were involving in my mind. I just couldn't stop thinking about them.
  #Person1#: That's normal after a tense work evening. Working overtime is not always a pleasant experience for me either. Once, I worked overtime everyday for a whole week including the weekend. That really broke my rhythm and I got a little sick later.
  #Person2#: Working at weekend is something I hate to do most.
  #Person1#: But if the company asks, what else can we do?