You will be given a definition of a task first, then some input of the task.
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: He is so kind . I couldn ' t believe he murdered his wife .
Person2:Of course not . I believe he ' s innocent .
Person1: I don ' t understand .
Person2:He nursed a viper in his bosom . His best friend Tony foamed him in . Tony first seduced his wife and then trapped him .
Output:
informal