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:       Look , Bob . This is a photograph I took during my trip to Australia .  
 Person2:Let me see it , can I ? This is a good photograph . Who are these people ?  
 Person1:        They ’ re people I met during the trip . That ’ s the ship we traveled on .  
 Person2:What a beautiful ship ! Who ’ s this ?  
 Person1:        That ’ s the man I told you about . Remember ?  
 Person2:Ah yes . The one who offered you a job in Australia .  
 Person1:        That ’ s right .  
 Person2:Who ’ s this ?  
 Person1:        Guess !  
 Person2:It ’ s not you , is it ?  
 Person1:        That ’ s right . I grew a beard during the trip , but I shaved it off when I came home .  
 Person2:Why did you shave it off ?  
 Person1:        My wife didn ’ t like it ! 

formal