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:       Have you ever noticed that serious pollution in modern cities goes from bad to worse ?  
 Person2:You said it . We ’ er breathing poisonous air every day .  
 Person1:        I think it ’ s time for the government to take strong action . And people should try to protect environment .  
 Person2:I absolutely agree with you . 

formal