Definition: You are given a conversation between two people. 'Person1:' and 'Person2:' are used to separate their respective dialogues. You are required to assign a label 'formal' if there is an absence of emotion and a presence of questions anywhere within the conversation. If such pattern is not found assign the label 'informal'.
Input:  Person1:       I've heard that you've made a new strange friend recently , Sophie . 
 Person2:Yes . He is an old man with a great sense of humour . Not only can he play the piano , he also draws pictures very well . 
 Person1:        So you can learn a lot from him . 
 Person2:Yeah , he has no children , so he sometimes feel s very lonely . I often go to his house to play and talk with him . That makes him feel very happy . 

informal