I'm in the community library coding away on some c++11
std::thread work when a library patron enters the quiet area asking to use someone's phone. To his chagrin, he was met with head shakes (no). Those desiring some quiet time with their work offered an occasional "shhhh" and one enterprising gent held up a library sign that read
"No Talking; No Phone Calls; Respect the space".
I'd been paying attention as I tried to focus on my work and the patron then inquired of me. As we headed toward an open area of the library, I tried to subdue him by reminding this is a quiet area. I produced my iPhone 6 Plus and indicated I will accompany him to place the call.
When the calls were complete, I returned to my work and was shortly notified by the patron that he would require the use of my phone again in about half an hour. I tried to impart to him a need to keep his voice down and if he would kindly request of another because I needed to focus on my work.
Sometime later I felt bad about denying his second request and I didn't feel right; I felt as if once I had rendered assistance, there was no reason not to again and perhaps I was creating artificial constructs as barriers considering the initial help I gave was enough.
Is there a way to go about helping someone in this situation without feeling like I am becoming a phone booth or are there behaviors I should prefer to ease my conscience?