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:       Does your child still believe in Santa Claus ?  
 Person2:Yes . She believes everything about him .  
 Person1:        How sweet .  
 Person2:Yes . If she doesn't believe it , Christmas won't be so exciting to her .  
 Person1:        When are you going to tell her that Santa Claus doesn't exist ?  
 Person2:I'm not going to tell her . She will find out and understand when she grows older . 

informal