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:       Tom , you're my good friend , right ?  
 Person2:Sure . What's the matter with you ?  
 Person1:        The exam ! The terrible exam ! I'm not ready yet . Can you tell me how to get good marks ?  
 Person2:Don't be so nervous ! Relax ! First , sleep early at night . Second , study two hours a day after school . Third , don't tire yourself out , but don't be lazy . Will that help ?  
 Person1:        Yes , thank you . 

informal