Sentence 1: I saw my friend Joe sitting in lobby today. 
 Sentence 3: He told me he had just listened to Beethoven's Ninth 
 Sentence 4:  I talked to him for an hour 
 Sentence 5:  I left him in the lobby and told him I would see him soon 
 Option 1: I kept him company, as he is a lonely old man. 
 Option 2: I kept to myself and did not talk to the lonely old man.