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:       What date is today ?  
 Person2:Why ?  
 Person1:        Didn't you notice the roses everywhere ?  
 Person2:I hear it's Chinese Valentine's Day ! Don't you know ?  
 Person1:        Oh , God . I just forgot it . I should have brought roses for my girlfriend .  
 Person2:It's not too late . Go to buy some now . 

informal