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:       Here ’ s a letter for you .  
 Person2:Let me see it .  
 Person1:        Who ’ s the letter from ?  
 Person2:It ’ s a letter from UCLA about my acceptance .  
 Person1:        Read it !  
 Person2:UCLA accepted me !  
 Person1:        Really ?  
 Person2:I ’ m not joking . I got accepted !  
 Person1:        I ’ m so happy for you !  
 Person2:UCLA was my second choice , but I ’ m happy knowing I ’ Ve been accepted .  
 Person1:        I am really proud of you .  
 Person2:You have no idea how proud I am of myself . 

informal