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:       Hi , Robert . What happened to your face ? It looks swollen .  
 Person2:I had to go get a cavity filled today .  
 Person1:        Did it hurt ?  
 Person2:I don't even wanna talk about it . It killed me !  
 Person1:        How long were you in the chair ?  
 Person2:It took quite a while , but the worst part was getting numbed . They had to give me 3 shoots .  
 Person1:        Well , I guess you've learned a good lesson , huh . You have to take good care of your teeth .  
 Person2:No kidding . Not only can ’ t I stand the pain , but man ... dentists are expensive . The bill is going to be humungous !  
 Person1:        Don't you have a dental insurance ?  
 Person2:I do , but it still does not cover everything . 

formal