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:       Robert , this is my friend , Mrs . Smith .  
 Person2:Hi , Nice to meet you .  
 Person1:        Nice to meet you too .  
 Person2:Mrs . Smith , what do you do for work ?  
 Person1:        I'm a doctor .  
 Person2:Oh . Where do you work ?  
 Person1:        New York University hospital in New York City . What do you do ?  
 Person2:I'm a teacher .  
 Person1:        What do you teach ?  
 Person2:I teach English .  
 Person1:        Where ?  
 Person2:At a high school in New Jersey .  
 Person1:        That's nice . How old are you ?  
 Person2:I'm 32 . 

formal