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:       Why are you so late ?  
 Person2:I've been through a lot today . I forgot to set my alarm clock last night , so I woke up late this morning . And what is worse , I missed the school bus .  
 Person1:        That's enough . Sit down . 

informal