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:       Cigarette ?  
 Person2:Oh , uh ... Thanks . Henry , do you have a light ?  
 Person1:        Sorry , here .  
 Person2:Thanks . Lovely day . Pity I ’ m on duty .  
 Person1:        I ’ ll stand in with you if you like . I ’ Ve got nothing else to do .  
 Person2:Oh , no . I couldn ’ t possibly . 

formal