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:       How are you ?  
 Person2:I ’ m great . Thanks .  
 Person1:        Did you need something ?  
 Person2:I need your help .  
 Person1:        How may I help you ?  
 Person2:I need to find this newspaper article .  
 Person1:        Have you checked the periodicals section yet ?  
 Person2:I forgot about that section .  
 Person1:        If you ’ d like , I can show you were to find it .  
 Person2:Could you do that ?  
 Person1:        Follow me .  
 Person2:Thank you for all your help . 

informal