Acura 2009 TL Owner's Manual page 482

AcuraLink (U.S. models only)
To cancel the appointment:
Select ''AcuraLink/Messages'' on
the Setup screen, then press ENTER.
Select the appointment message
then press ENTER. You will see the
screen to cancel as shown. To cancel
the appointment, select ''Cancel
Appointment,'' then press ENTER.
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The system will request you to
confirm the cancel on the navigation
screen. To cancel the appointment,
select ''YES,'' then press ENTER. If
you select ''NO,'' the screen goes
back to the previous message display.
The system will automatically
connect to the Acura server, then
show you the confirmation on the
navigation screen. If you accept the
cancel, press ENTER.