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:       Joseph , who is that woman ?  
 Person2:That's Susan .  
 Person1:        What does she do for work ?  
 Person2:She's a lawyer .  
 Person1:        Is she American ?  
 Person2:No , but she speaks English fluently .  
 Person1:        She's really tall . Do you know her ?  
 Person2:Yes , I know her . We're friends .  
 Person1:        Who's that man standing next to her ?  
 Person2:Which man ?  
 Person1:        That short guy on her right . What's his name ?  
 Person2:Oh , that's Matt .  
 Person1:        He's really good looking .  
 Person2:Yeah .  
 Person1:        Do you know him ?  
 Person2:I don't know him , but I think my sister does .  
 Person1:        Is he married ?  
 Person2:Yes , he's married .  
 Person1:        I remember now . I met him before . 

informal