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:       I hear that Helen does not relate very well to her husband .  
 Person2:Unbelievable ! I remember her husband is her former classmate . They fell in love with each other in college .  
 Person1:        So what ? Things have changed . 

formal