Hi there, %staffname%!

%customername%, who had scheduled an appointment for
%servicename% on %olddate% at %oldtime%, has rescheduled their
appointment.
Details of the updated appointment:
Date: %olddate% to %appointmentfromdate%
Time: %oldtime% to %appointmentfromtime%
For: %servicename%

%meetinginfo%
The other attendees are:
%cohosts%

Good luck
%adminname%
%businessname%