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:       Hi , Mary , it ’ s been a long time  
 Person2:Hello , my old friend . Long time no see . How are you doing ?  
 Person1:        Well , I ’ m doing okay . And how about yourself ?  
 Person2:Not so well . To be honest with you , I broke up with Tom .  
 Person1:        Oh . I ’ m sorry to hear that . What happened ? 

formal