Dennis,
I have found that I can provide that level of support oftentimes by just sending a quick email message from my smart phone that says, "I can't get back with you right now, but I wil in the next ___ hour or so..." and then get back with them in a timely manner. They realize you are on the other end, you did get their message, and an answer is coming soon. That doesn't mean I answer every question 24/7/365 but ensures that the students still feel supported.
Herbert Brown III
