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:       What's the matter with you then ? You look miserable .  
 Person2:It's us .  
 Person1:        What do you mean by us .  
 Person2:Well , you always say you're busy .  
 Person1:        That's right .  
 Person2:And you often go back to live with your parents and leave our son in the room by himself .  
 Person1:        I ... I ... I miss my parents , also they miss me .  
 Person2:Oh I remember , I cut terrible calls , and you didn't say anything about it .  
 Person1:        You mean I am groaned a few words ?  
 Person2:Totally not . Perhaps it's about our marriage . 

formal