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:       Did you read the letter in the paper about smoking ? The person who wrote that must be crazy .  
 Person2:I don't think so . I think the government should do everything it can to discourage people from smoking .  
 Person1:        Maybe so . But a law banning cigarettes would do no good .  
 Person2:No.You can't suddenly make smoking illegal . But the government could prohibit smoking in public places like cinemas and theaters . 

formal