answer: #Person2# didn't go to work because of #Person2#'s sick son.
documents: #Person1#: You didn't come to work yesterday. What happened? 
  #Person2#: I had to look after my son at home. 
  #Person1#: What's wrong with him? 
  #Person2#: He has a fever. 
  #Person1#: Is he getting better now? 
  #Person2#: I think so. Thank you.