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 persons are there in your family ? 
 Person2:There are three , my parents and I . 
 Person1:        Do you live together ? 
 Person2:No , I live alone in a flat near my work place . 
 Person1:        Do you often go back to see your parents . 
 Person2:Yes , almost once a week . 

formal