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:       The world changes , the family changes too . 
 Person2:What do you mean ? 
 Person1:        People now like a small family composed of two parents and one child . 
 Person2:That is called a nuclear family . 
 Person1:        I don't like such a family . 
 Person2:What kind of family are you like ? 
 Person1:        I like a family composed of many people . It includes grandparents , parents , aunts and uncles , and children . 
 Person2:It's a traditional family . It may be too large to live well . 
 Person1:        We can live well , I think . 

formal