Service is not present in the Service List but can be added as a preferred service for the customer using the `addc` command

[simjunheng]

I've added facial and message as a service preference for a customer but since it is not a valid service (a service not present in the service list), should this be flagged out as an error?

The newly added customer as shown below:

Scrolled through the service list + ran finds facial but did not find any service named facial