I recently had an appointment for two hours with a provider and upon arrival was asked if one hour would be OK because she had some personal business that suddenly came up. The time element was not a problem but I had made up an envelope for two hours with larger bills and I did not have the correct bills for her one hour rate. I ended up leaving a 50 dollar tip before we even started because I did not want to talk money and this was my first time with this provider. Fortunately the tip was well worth it. However, I do not like leaving a tip on the front side.What is the best way to handle a situation such as this? And a related question what is the best way to leave a tip without it becoming ackward or detrimental to the good time???