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: Can you vouch for me that I was with you yesterday ?
Person2:Why do I need to do that ?
Person1: My character is in question . Someone was robbed at work and unless I have an alibi , I'm a suspect .
Person2:Oh , my goodness . Who do I need to talk to ?
Person1: My employer . Can you come in to the office tomorrow ?
Person2:Absolutely . I think I still have the boarding passes from our flight here somewhere .
Person1: That would be the real proof . Didn't we have to show ID to get on the plane ?
Person2:Since 911 I think every airline requires that the passengers show ID to board .
Output:
informal