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:       How many people are there in your family ?  
 Person2:Five . Besides my parents and me , there are my brother and sister .  
 Person1:        That is a big family . How old is your sister ?  
 Person2:15 .  
 Person1:        What about your brother ?  
 Person2:He ’ s not quite 25 .  
 Person1:        Do you miss your family ?  
 Person2:Yes .  
 Person1:        Do you often go home ?  
 Person2:No . But I write to them often .  
 Person1:        How often do you write to them ?  
 Person2:Once a month . 

formal