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:       Did you hear what happened to Mike last night ?  
 Person2:No , what ?  
 Person1:        Well , apparently he had too much to drink and got into some kind of trouble . Typical , isn't it ?  
 Person2:Oh , no . What kind of trouble ?  
 Person1:        Well , I don't know the details , but ... 

informal