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:       Holly , I just heard some terrible news .  
 Person2:Me , too . I overheard someone say Taylor has a brain tumor .  
 Person1:        What ? No , I heard that he has stomach cancer . His ex-girlfriend said it .  
 Person2:That could explain all his stomachaches . He's trying to hide it from us .  
 Person1:        Maybe that's why he didn't show up at the potluck . Have you seen him ?  
 Person2:No , but someone said he was in the men's room puking . Follow me ! 

formal