text: John: Happy birthday Anna!! 
  Anna: Thanks :) 
  John: How's your mum? 
  Anna: She's fine, thanks for asking
  John: How long is she going to stay? 
  Anna: Uhm... I don't know to be honest 
  John: :) I see 
  John: Say hello to her! 
  Anna: I will. Thanks
target: John wishes Anna happy birthday. John asks about Anna's mum. Anna doesn't know for how long her mu is staying.