Most of us thank people when we've received something or when someone has delivered a solution to a problem. But do we always thank people when we do not get something? Do you thank people when they take the time to look for a solution, but don't find one? Or when they simply take the time to listen to you? And do you thank them again when, months later, you get the job or the project—that they helped you with by connecting you with the right person?