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:       Every year , the South has the floods . It is an act of God .  
 Person2:Do you really think so ?  
 Person1:        Yeah , you have some other ideas ?  
 Person2:I think , in some way it is an act of God , but in another way , it just is caused by us .  
 Person1:        For example ?  
 Person2:We didn't pay attention to the environment , cut down trees and polluted the air .  
 Person1:        Oh , I see . Fortunately government has taken some action to prevent such things . 

formal