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:       I am going to celebrate my birthday with you all in a night club this year , what do you say ?  
 Person2:Fantastic ! I enjoy clubbing , especially those clubs with live bands . The only fly in the ointment is that the air is bad , full of smoke , and the music is too loud , so conversations are not really possible . Once I nearly got burnt by a cigarette .  
 Person1:        How did that happen ?  
 Person2:A wild dancer dropped it on my left foot and said nothing about it . If I had drunk enough and I would have had the bold to punch him in the face .  
 Person1:        Sounds cool ! But that is not what a lady should do . People are easy to lose head in a night club and being drunk . 

formal