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:       What's Ron Marston like , Pauline ? 
 Person2:He's awful ! He telephoned me four times yesterday , and three times the day before yesterday . He telephoned the office yesterday morning and yesterday afternoon . My boss answered the telephone . 
 Person1:        What did your boss say to him ? 
 Person2:He said , Pauline is typing letters . She can't speak to you now ! " Then I arrived home at six o'clock yesterday evening . He telephoned again . But I didn ’ t answer the phone ! 
 Person1:        Did he telephone again last night ? 
 Person2:Yes , he did . He telephoned at nine o'clock . 
 Person1:        What did you say to him ? 
 Person2:I said , This is Pauline's mother . Please don ’ t telephone my daughter again ! 
 Person1:        Did he telephone again ? 
 Person2:No , he didn't ! 

informal