answer: Bob invites #Person1# to a piano concert this evening.
documents: #Person1#: Hi, Bob! How are you doing?
  #Person2#: Fine! How are you?
  #Person1#: I'm fine too, thank you.
  #Person2#: I've come to tell you I'm going to the concert this evening. Will you come with me? I've two complimentary tickets.
  #Person1#: With the greatest pleasure. Where is the concert this evening?
  #Person2#: It will be held at the Music Hall.
  #Person1#: What's on the program?
  #Person2#: It's a piano recital. I'm fond of piano, you know.