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:       You know , smoking does do harm to your health .  
 Person2:Yes , you're right .  
 Person1:        Why don't you try to give it up ?  
 Person2:I've tried to give up smoking several times , but it's no good . Smoking relaxes me .  
 Person1:        Have you ever thought of just cutting down ? You could do it gradually .  
 Person2:Yes , maybe I should have another try . 

informal