Interesting phone call

I had a phone call yesterday from a customer service agent giving me a customer's reservation number, if that makes it easisest for me to look them up she says. Actually, it helps to know the question first before looking up a person's reservation number. I ask if they just need directions to the airport. No ma'am, she says, they want to extend their rental and need our authorization to modify it. Authorization to extend a rental? That is a new one. I am used to getting authorization for an extension from the credit card company. Anyway, I prefer the contract number of the rental instead of the reservation number. Well, the customer on the other line hung up so she apologized for distrubing me. Whatever. I thought it strange because the customer service number is not given to customers until they return the car and it appears on their receipt. Post later.