Haha well my guess is so you don't completely mess up whatever service you are doing 4 them just a guess
It is because the customers are the reason for our existence. The life of our business lies in them.
Its important to take time to listen to customers as they may have some worries about the treatment they could be having,or they could have some learning difficulties,eg hard of hearing.They could want some information off you about other appointments and some information about the doctor they are seeing.