text: Bella: Hi Tonia! You tried to phone me? Sorry my mobile was muted.
  Tonia: No pro. Just wanted to confirm the invitation for tomorrow.
  Bella: Thank you. We are looking forward to seeing you at last.
  Tonia: Yes, it's going to be a great evening. Do you think you could come at 7:30 instead of 7:00?
  Bella: But of course!
  Tonia: Sorry about this change but it seems I have to baby-sit longer than I thought. Mary is down with a flu and their nanny cannot  be with them on Sundays.
  Bella: Really no need to explain. Half an hour makes no much difference, does it?
  Tonia: Thank you so much, Bella.
  Bella: Don't mention it. Just lovely that we'll meet.
  Tonia: So see you all tomorrow at 7:30!
  Bella: CU
target: Tonia wants Bella to come at 7:30 instead of 7:00 tomorrow as she has to baby-sit longer.