Instructions: 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 .
Output:
formal