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 is wrong with your face ?  
 Person2:My brother did it .  
 Person1:        Why ?  
 Person2:I laughed up my sleeves at him . He ’ s seen his girlfriend off at the airport and had lipstick on his face and did not know it . 

formal