Concatenatex evaluated for multiple expressions?

[mrhk22]

I am currently using the following measure that returns the contact names of clients for whom there are "Meeting" service records in a table:

Meeting Recipients
=calculate(CONCATENATEX(values(ServiceHistory[Contact Name]), ServiceHistory[Contact Name], “, “), ServiceHistory[Service Type]=“Meeting”)

I set this up in a pivot table with an Account Name column (ServiceHistory[Account Name]) and a column with the "Meeting Recipients" from that account.

How would I modify the measure so that it returns contact names with "Meeting" service records who do not have any"Consultation" service records (i.e. ServiceHistory[Service Type]=“Consultation”)?

Thank you for pointers.