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: I am certain I am going to fail my English test .
Person2:Why are you so pessimistic ?
Person1: Because it's impossible to improve listening level within a week .
Person2:Only for this reason ?
Person1: Yes , I think my vocabulary and reading comprehension are not very bad .
Person2:Don't worry about it . Practice makes perfect . I will lend you some listening materials , so that you can practise more before the exam . I believe you can pass the exam with good preparation .
Person1: Oh , thank you . That's very nice of you .
Output:
informal