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 seldom heard the quarreling of her children .  
 Person2:Why do you say that ?  
 Person1:        Because her children have been the age when they seem to quarrel all day long .  
 Person2:Oh , I see . She told me that she had learned very quickly how to pour oil on troubled waters , but not to pour oil on the flame .  
 Person1:        She is a clever mother . 

formal