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'm going to Japan this year on vacation .  
 Person2:Have you ever been to America ?  
 Person1:        No , but I'd really like to .  
 Person2:You'd like it . 

informal