I couldn't get the parts until the morning

Every service technician that works for the HVAC company where I work is responsible for working one weekend every month. The weekend starts on Friday afternoon and it doesn’t end until Monday morning. A lot of service technicians don’t like the rule, but it’s only one weekend out of the month. I get three and sometimes four weekends off the rest of the month. The HVAC company is always very busy during the weekend, because we are one of only two companies that are open for emergency services on the weekend and after hours. Last weekend was my turn to work and I was busy all weekend. It was extremely cold and frigid and we even had an inch of snow on Saturday afternoon. I expected to spend most of the time working on heating problems. On Saturday night, I received a call from a frantic customer shortly before midnight. That customer was totally out of heat and the furnace was not working. The woman was terribly upset because she had a baby in the house. I responded to the call in less than 30 minutes. I quickly realized the furnace needed a new part, but I could not get the part until the morning. The older style france was a bit aged, but the new part would fix the problem easily. I gave the customer a couple of space heaters from my work truck. I didn’t charge her for the rental since I was coming back in the morning. She was very thankful and didn’t get mad that I couldn’t fix the problem until the morning.