Given the task definition and input, reply with output. 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'.

Person1: Can I borrow these magazines ?
Person2:Fill in the slip , then take it to the circulation desk . They will get you what you want .
Person1: Are we allowed to go into the stacks to look for books ?
Person2:Sorry , the stacks are closed to undergraduate students .
informal