Confirmation email not displaying client name

Hi
I've configured the confirmation email in A+ as follows, but the email I receive only shows "Dear ," with the client name absent.

Dear CLIENT,

We are pleased to confirm your appointment for SITE_NAME.

Here are the appointment details:
Requested service: SERVICE
Date and time: DATE_TIME

SERVICE_PROVIDER will assist you for this service.

Kind regards,
SITE_NAME