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:       Do you have brothers and sisters ? 
 Person2:No , I am the only child in my family . 
 Person1:        Oh , I have an elder sister . She is married .. Her husband is a businessman . 
 Person2:Do they live with you and your parents ? 
 Person1:        No , they live alone . 

formal