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:       Would you mind if I make a suggestion ? 
 Person2:Of course not , go ahead . 
 Person1:        Maybe you should try to quit smoking . You know it is very bad for your health . 
 Person2:Well , sure it is . Actually , I have been cutting down the amount since two months ago . I used to smoke a pack of cigarettes for a single day . Now I limit it to 6 cigarettes a day . 
 Person1:        You have made a big progress . Quitting smoking is not an easy job . But it will be rewarding in the long run . 
 Person2:Thank you for your suggestion . 
 Person1:        You ’ re welcome . 

informal