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:       Tell me something about your Valentine's Day .  
 Person2:Ok , on that day , boys usually give roses to the sweet hearts and girls give them chocolate to return .  
 Person1:        So romantic . Young people must have lot of fun .  
 Person2:Yeah , that is the holiday is hot , isn't it ? 

informal