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:       You ’ re making my blood boil .  
 Person2:Calm down . Madam .  
 Person1:        I'm about to explode ! You ’ Ve made a mess of this matter .  
 Person2:I am very sorry to hear that you ’ Ve been having so many problems .  
 Person1:        Sorry isn ’ t good enough ! What can you do to help me ?  
 Person2:I understand why you ’ re angry , Mrs . Wilson , and believe me , we are doing everything in our power to work this out .  
 Person1:        Well , obviously , what you ’ re doing is not good enough !  
 Person2:If you could just give us a few more days , we should be able to get this straightened out . 

informal