To me the idea of asking "to be squeezed in" not only shows a lack of respect for the lady but also shows a lack of preperation and care on the clients side.
Granted, I have rang one or two ladies at short notice myself - but if they were busy I would never attempt to get "squeezed in" If a lady is busy it's because someone else had the foresight to book in advance before me - not her fault - that's mine!