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: What is your case against the police ?
Person2:They arrested me for nothing .
Person1: What do you mean ?
Person2:They weren ' t supposed to arrest me .
Person1: Didn ' t they let you go ?
Person2:They didn ' t let me go until the next morning .
Person1: So they kept you at the station ?
Person2:They sure did .
Person1: Did they tell you why they arrested you ?
Person2:I matched the description of a robbery suspect .
Person1: I understand .
Person2:I want to take them to court .
A:
informal