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: I think you should look over these figures again . There are some calculations that are a bit off .
Person2:I apologize . This should not have to be this way .
Person1: Apology is accepted . Try to do better next time .
Person2:Of course , I should have been more careful . I ' m sorry .
A:
informal