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
John wishes Anna happy birthday. John asks about Anna's mum. Anna doesn't know for how long her mu is staying.