Who is Charlie Adair from Spencerville and what is their importance?

Charlie Adair is Keith's former boss. He often guided Keith through spy missions and debriefed him when they were over. When Keith is forced into retirement, the President asks for him by name to fill a slot on his staff. Charlie travels to Spencerville to tell Keith about the job offer and even convinces him to fly to Washington, DC to accept the job. Keith passes on the job, but he meets with the President anyway. As a result, Keith to miss his meeting with Annie,. In the end, Charlie attempts to be a friend by offering to help Keith get Annie back, but Keith knows that everything Charlie does comes with strings attached, therefore he refuses the help.