I don't get the massage, just the extras, So it is easy for me to make conversation. I tell them what i want done to me next and inbetween, little conversations start. I just say "what's your name? so i know who to ask for next time". That way, even if they are shit, you know when not to come back if they are working. Sometimes i will ring the shop before i go to see who is working.
Keep in ming: You have the money, you get to dictate whar service you want. If they can't provide what you want, don't be afraid or embarrassed to walk.