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:       Our neighbour ’ s tape recorder is so loud that it annoys us to death . I ’ Ve made up my mind to cut the electricity off .  
 Person2:What ? That would be to cut off your nose to spite your face .  
 Person1:        Then what shall we do ?  
 Person2:Call the police . 

informal