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 Tom got divorced , and I don ’ t know how he is now .  
 Person2:Out of sight , out of mind .  
 Person1:        Who do you mean ?  
 Person2:Don ’ t you know they have had little affection for each other ? 

formal