Enterprise Rent-A-Car

I have been using this location for over 2 years since I moved to Olive Branch, Ms.
I have always enjoyed the Employees and the several Managers that have been shuffled through this location.
I am a regular renter about every 2 weeks, last week I had a bad experience with an Employee Desiree Surratt, I brought my concerns to the Manager, as I almost never complain, but I run 15 Stores and customer service is the most important process of my business.
I’m assuming Adam Manager spoke with her, as I went in to return my vehicle today 12÷15÷15, there were about 4 individuals inside. she was returning a Vehicle, when she was done, she asked is there anyone else doing a return, I held my hand up, and she just Commented «Adam can help you», I took that as refusing to service a customer, as the Manager was outside checking in a car.
As soon as Adam came in, he took care of me, I followed him outside and expressed my concerns about my service.
As a solid customer, I feel this needs to go a little higher, she has to understand that everyone makes mistakes, including myself, whatever the Manager discussed with her prior, she took it personal and it shows in her service towards Me the customer. My concern is if she is working Alone, am I going to get any service??? If I do am I going to get the Enterprise Experience or a version of it!
Thanks