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:       Have you heard my good news ?  
 Person2:You haven't told me anything yet .  
 Person1:        I got a promotion at work earlier this week .  
 Person2:Is that right ?  
 Person1:        It's the truth . I am really happy .  
 Person2:Congratulations on your promotion .  
 Person1:        Thank you very much .  
 Person2:I am really excited for you .  
 Person1:        Are you really ?  
 Person2:I'm serious . You deserved this promotion .  
 Person1:        Is that what you really think ?  
 Person2:Yes , I do . 

informal