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 does your friend Jim do ?  
 Person2:He is a teacher , but he makes a little money on the side by repairing cars in his free time .  
 Person1:        He can repair cares ? I cannot believe it .  
 Person2:Believe me , he is the first-class . 

informal