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:       What a police officer !  
 Person2:I ’ Ve never seem such a scene either except in films .  
 Person1:        It ’ s really unimaginable . The police officer screamed at the driver and used bad language , but the driver took it on the chin . 

informal