answer: Li and #Person1# decide to go for a drink tomorrow.
documents: #Person1#: Are you free this evening, Li?
  #Person2#: I'm afraid I'm busy tonight. I'm having dinner with friends.
  #Person1#: What a pity. I wanted to go for a drink with you.
  #Person2#: What about tomorrow? Are you doing anything tomorrow?
  #Person1#: No, I haven't got any plans.
  #Person2#: Shall we go out tomorrow then?
  #Person1#: Why not? Sounds good to me.