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:       Hello ? 
 Person2:Hello ? Mr . Bernie . My name is Lisa . I hope I ’ m not disturbing you . I just heard about your daughter . I wanted to call you and tell you how much we ’ ll miss her . 
 Person1:        I ’ m sorry . I think you are calling the wrong person . My name is not Mr . Bernie . 
 Person2:What ? That ’ s odd . I ’ m so sorry if I ’ Ve bothered you . 
 Person1:        No problem . 

informal