Hi,
Check out this example:
Example:
--------
This notification  informs a user when their case is closed.

To configure a notification for a closed ticket, configure a Notification(Event) as so: (if not specified, leave as blank)

Recipient : Customer
Event : TicketStateUpdate
State : Closed successful / Closed unsucsessful
Enter you desired subject and text. For mine its:

Hi <OTRS_CUSTOMER_DATA_UserFirstname>,
Your ticket has been closed.  If the issue has not be resolved to your
satisfaction, please feel free to contact IT Helpdesk.

Your Request was:
=====================================================================
<OTRS_CUSTOMER_BODY[50]>
=====================================================================

Our support team has closed the ticket with the following comment(s):
=====================================================================
<OTRS_AGENT_BODY>
=====================================================================
Kind Regards,
<OTRS_CURRENT_UserFirstname> <OTRS_CURRENT_UserLastname>
Michael Mayaka