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:       Are you a smoker ?  
 Person2:Yes , I'm afraid I am . My husband is a smoker too .  
 Person1:        Would you describe yourself as being a heavy smoker ?  
 Person2:No , but my husband smokes twenty or more a day .  
 Person1:        When did you begin to smoke ?  
 Person2:I had my first cigarette when I was seventeen .  
 Person1:        Might I ask if you have tried to give up smoking ?  
 Person2:Yes , twice . 

formal