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 , are you Miss Green ?  
 Person2:Yes . May I help you ?  
 Person1:        May I introduce myself ?  
 Person2:Yes .  
 Person1:        I ’ m a new student in the school . My name ’ s John .  
 Person2:Nice to meet you , John .  
 Person1:        It ’ s a pleasure to meet you , Miss Green . 

informal