Me, 10am: sorry I didn't respond, I was resting, as I mentioned. Are you free now?
Me, 10.30am: I can see you're still offline. I'll pencil in a meeting at 11.30am. Now worries if you can't make it, just let me know when you are free. [His calendar showed him free all morning.]
Me, 11.30am: *enters meeting, still not sign*
Me, 11.33am: I'm around until 12 noon. Otherwise let me know when you're free.
Him, 11.38: I'm here - had to run an erand.
Me, 11.38: Are you free now? I'm in the meeting.