From the report navigation menu select the Transactions Export

Export the report for the selected date range

Import the report into Google Sheets or Excel

Filter by column J and choose just guest passes
The client associated with this guest pass noted in columns D (first name) and E (last name) is the client who brought the guest. This client is not the guest.

Use the client search within your Walla site and enter in the clients first and last name from columns D and E in the report

From the client's profile select the Bookings Tab

Scroll down to the booking that says Guest Pass

Select the name of the class that is associated with the guest booking

On the roster you will find the name of the guest the client brought