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 don't like the merry-go-round . 
 Person2:But , I want to ride it , Daddy . 
 Person1:        Ok , I guess it's worthy of two yuan . 
 Person2:Great . Let's go . 

informal