text: Zack: Hey, I think I've lost you guys. Any chance of seeing you later on? I'm leaving for London tonight so it'd be great if we managed to hang out
  Louise: Sorry Zack!! 
  Zack: No worries
  Louise: We'll be attending the keynote speech and we've booked the dinner as well, so there's still chance to talk. Will you be joining us?
  Zack: Ahh that's great, thanks. Yeah, I'll see if I can catch up with you at the keynote speech. Otherwise, see you at the dinner
  Louise: Perfect, we'll be looking out for you
  Zack: Thanks!
  Louise: See you in a bit
target: Zack lost them ant wants to catch up later because he is leaving for London tonight. Louise is going to the keynote speech and dinner. Zack will see if he can make it for the keynote speech, but will join them for dinner.