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:       So , John , what do you do for a living ?  
 Person2:I ’ m a sales manager in a publishing company .  
 Person1:        Oh , really ? That sounds interesting , what kinds of book do you publish ?  
 Person2:Oh , mostly fiction , lots of romance , science fiction , biography , stuff like that .  
 Person1:        Oh , What a cool job ! How long have you worked there ?  
 Person2:About two years now . 

informal