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:       Which school is your children in ?  
 Person2:She is now in a private school .  
 Person1:        Oh , it costs too much . It's more expensive than the public school .  
 Person2:It's idea of my husband . He is always banging the drum for better schools .  
 Person1:        But the private school amount to better schools . 

formal