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:       Steven , it's ten o'clock . I'm going to bed . I'm beat .  
 Person2:Okay . I'm going to stay up a while . I've got to go over the household budget . We've sightly overspent this month .  
 Person1:        Oh , can't you do it tomorrow ? It's already past 10 .  
 Person2:But I'm not sleepy , darling . I want to finish it today .  
 Person1:        Okay . Please close the door to the basement before you go to bed . I don't want the dog down there tonight .  
 Person2:Okay . Good night . Have a good dream .  
 Person1:        Good night . 

informal