Detailed 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'.
Q: Person1: Please tell us the exact time when the big fire broke out .
Person2:The exact time ? Let me think . You know , it happened at night .
Person1: But we need the exact time . What time ?
Person2:Oh , I remember . It was about 10 o'clock . When I was about to go to bed , suddenly I heard help outside .
A:
informal