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.My father , mother , brother , sister-in-law and me .  
 Person1:        Is your brother older or younger than you ?  
 Person2:He is five years older than me , He got married last Sunday.My brother and my sister-in-law are the same age . 

formal