You have no doubt, regardless of generation, heard the term 'A Man's Word and a Handshake'. It is usually used in conjunction with how lawyers have contributed greatly to the problems in America.
Well some of us still believe in that old adage and practice it in an ongoing and unspoken philosophy relied upon daily. Not just a Man but an Adult. When a person gives his/her word and agrees to certain terms in an open forum and then avoids your attempts to contact for the follow up it is apparent