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 cannot understand why she always helps and supports her brother .
Person2:Why do you say so ?
Person1: Because he is often in trouble .
Person2:She has promised her mother that she would be with him through thick and thin .
Person1: Oh , I see .
Output:
formal