There are way too many to name at my last position. I was called waste management due to how I could fix mistakes that people made and deal with clients who may be a little bit difficult. How I normally handled them is kind of just let them vent, be very patient, very understanding, very sympathetic, and once you do that and apologize for the mistake that happened then just work hard on trying to lighten the conversation and get the fix handled quickly and get it taken care of for the client.