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:       Bob's sister will go to America .  
 Person2:Why tell me ? She has nothing to do with me !  
 Person1:        I thought you wanted to know more about her .  
 Person2:No , I couldn't care less ! 

informal