answer: #Person1# invites Helen to #Person1#'s party next Saturday. Helen tells #Person1# she may have something on that day but she'll drop by if she can.
documents: #Person1#: Helen, did you hear I ' m having a party? Next Saturday in my place.
  #Person2#: I may have something on that day, but thanks for inviting me.
  #Person1#: Well, drop by if you can.
  #Person2#: I will, do you want me to bring anything?
  #Person1#: No, just bring yourself. I hope to see you there.