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:       How do you feel about teaching my friend how to read ? 
 Person2:How old is your friend and why doesn't he know how to read ? 
 Person1:        He's 78 and he's a new emigrant from South America and he's never been to school . 
 Person2:Does he even know how to speak English ? 
 Person1:        No . But I thought that you could start with reading and then go from there . 
 Person2:That was very thoughtful of you to volunteer me . 
 Person1:        Come on . You're great at teaching and I know you will love him . He's adorable ! 
 Person2:Oh , all right . Have him come over here for dinner . But you get to make dinner ! 

formal