If I understand your question right, I think you were trying to discuss something about your son/daughter with the teaching pro and he/she seems busy and not responsive.
I found that it is helpful to discuss about your child during the lesson time(that you are paying for). For a busy teaching pro, that is the way to go. The pro might not have time to talk with you because he/she has to teach student one after another. Email is also a good way of communication and ask specific questions especially if you are also busy.
Most pros will make an effort to discuss your child's tennis.