answer: Jim tells Alice that it's his little niece Ellie who's singing at his house. Alice tells Jim that today is her birthday and invites Jim to her birthday party tonight.
documents: #Person1#: Who's singing in your home, Jim?
  #Person2#: It's Ellie and her friends.
  #Person1#: Who's Ellie?
  #Person2#: She's my little niece. It's her birthday. They're singing ' Happy Birthday '.
  #Person1#: Oh, I see. how old is she?
  #Person2#: She's ten.
  #Person1#: I suppose they're playing games.
  #Person2#: Oh, yes. Ellie was playing games all day yesterday. By the way, Alice, when's your birthday?
  #Person1#: Today.
  #Person2#: Today?
  #Person1#: Yes.
  #Person2#: Well, imagine that! How old are you?
  #Person1#: Eighteen. Some friends are having a birthday party for me tonight. Do you want to come?
  #Person2#: Very much. What time?
  #Person1#: About 6.
  #Person2#: I'll be at your house at about five thirty. Happy birthday.