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's this then ? 
 Person2:It's my geography , sir.The Map of Africa you set us . 
 Person1:        But this should have been handed in last Thursday . 
 Person2:Yes , I know , sir . I'm sorry . 
 Person1:        Well , what's your excuse then ? 
 Person2:My mother's been ill and I had to stay at home . 
 Person1:        Oh , Yes ? 
 Person2:It's true , sir . 

informal