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:       The Canada Day is on the 1st of July . 
 Person2:What is its national anthem ? 
 Person1:        The national anthem of Canada is ' O Canada ' . 
 Person2:Can you sing the song ? 
 Person1:        Yes , I could sing it when I was very young . 

formal