I have a form named "Clients" with a "client_name" field

and a form named "Carriers" with a "carrier_name" field.

In a separate form named "Policies" I have both the above fields as lookup fields.  I have a field named "Policy_name" which i would like to be named:

client_name + carrier_name

The formula I have is:

 input.Client_name + " - " + input.Carrier_name

But this returns the ID numbers for both

How do I get it to display the Names instead of the number?