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:       Excuse me . I'm afraid you're in my seat . You've moved my books .  
 Person2:Oh , dear .  
 Person1:        You must have realized somebody was here .  
 Person2:Oh , well , I looked around . There wasn't any other space . I waited a while and nobody came . I'm sorry if I've taken your place . 

informal