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:       Hi , Mike . Haven't seen you for a while . How's Cathy ?  
 Person2:We are not seeing each other any more .  
 Person1:        What happened ? Did you break up ?  
 Person2:Yeah . I got sick and tired of her nagging all the time .  
 Person1:        Oh , I am sorry . Maybe you were just emotional at that moment . Do you think you guys can get back together ?  
 Person2:I don't know . There ’ s plenty of fish out there in the sea !  
 Person1:        Oh , you are such a dog ! 

informal