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 couldn ’ t believe you should crack such a joke to them .  
 Person2:What was wrong ?  
 Person1:        You carried it too far . You obviously offended someone .  
 Person2:I didn ’ t mean to hurt anyone .  
 Person1:        I know , I know . But someone took offence . 

formal