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:       Graham , why are you always on the phone with Jane ? 
 Person2:Because we are partners in our science lab . Why are you so jealous ? 
 Person1:        The other night when you came home there was lipstick on your right cheek . How do you explain that ? 
 Person2:My aunt Mary just flew in from Cleveland and she laid one right on my right cheek . 
 Person1:        Are you sure ? 
 Person2:Of course I am . I only love you , Amy . 
 Person1:        Okay , I'm sorry . I believe you . 
 Person2:Why do you always accuse me like that ? 
 Person1:        Because you are the most handsome boy at the university and I love you so much ! I guess I just go crazy sometimes . That's all . 
 Person2:Oh , Amy . I am the luckiest guy in the world . 
 Person1:        Why ? 
 Person2:Because I am loved by the most beautiful girl in the world ! 
 Person1:        Oh . Graham . I love you so much and I really believe in our love . 

informal