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:       I've got to go home and study . 
 Person2:For what ? 
 Person1:        The test tomorrow . 
 Person2:If you don't know it by now , you might as well not bother studying . 

formal