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:       Did you lock the doors ?  
 Person2:All except the back door . I left that open for Tim . He took the dog for a walk .  
 Person1:        Well , I ’ m going on to bed . I ’ m beat .  
 Person2:Ok , I ’ m going to stay up awhile . I ’ Ve got to go over the household budget , We ‘ re a little over-spend this month .  
 Person1:        Please told Tim to close the door to the basement . I don ’ t want dog down there tonight .  
 Person2:Ok , Good night , see you at breakfast . 

formal