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:       Jim , I heard you ’ Ve bought a new computer . 
 Person2:Yes . Look , it is on my desk . 
 Person1:        Your office looks different with a computer . By the way , is it difficult to use a computer ? 
 Person2:Not at all . It ’ s a piece of cake . 
 Person1:        A piece of cake ? 
 Person2:Yes . It ’ s easy and convenient to use a computer . But it takes a long time to really master it . 

informal