do something on the phone / start chatting with clients

I actually don't start conversations with other clients, but I used to see a certain client belonging to the other T at my T's practice. Even though the appointment times for the two therapists were staggered so that the waiting room was almost always empty when you got there, this particular woman would be there really early for her appointment and would always chat to me during the short time we were both waiting. I got to know all about her house, her daughter and her daughter's family, her pets and her daughter's pets, etc. I felt a little bad when my schedule changed, knowing I'd not see her again, but it felt vaguely against the rules to ask to friend her on Facebook. Given how we met, we didn't even know each other's first names.