Wow. Points for the friendliest USPS employee I've ever interacted with. I wish I'd gotten her name. All I needed was to make sure I had the right postage on my larger-than-usual letter. I said so and she said all righty. She checked it and said yep you're fine. You need anything else today? I said nope I just want to mail this in. She said okay if you're ready to mail it I'll take it now. You have a good one! I said thank you, you too!
That sounded like a normal customer service interaction to me!