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:       He is so kind . I couldn ’ t believe he murdered his wife .  
 Person2:Of course not . I believe he ’ s innocent .  
 Person1:        I don ’ t understand .  
 Person2:He nursed a viper in his bosom . His best friend Tony foamed him in . Tony first seduced his wife and then trapped him . 

informal