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:       Excuse me . Is this seat taken ?  
 Person2:No , it isn't .  
 Person1:        Am I on right bus to Chicago ?  
 Person2:Oh , no . This is going in the opposite direction .  
 Person1:        Oh , my God !  
 Person2:I suggest you get off at the next stop and ask again at the station .  
 Person1:        I will . Thank you . 

informal