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 big is your family ?  
 Person2:My family is not big , there are only 3 of us-my parents and I .  
 Person1:        Who supports the family ?  
 Person2:My father supports the family , and he is the sole breadwinner . My mother is a housewife .  
 Person1:        Do you live with your family ?  
 Person2:Yes , we live a happy life together . 

informal