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: Excuse me . In this museum , you are not supposed to take pictures .
Person2:Is that right ? I didn't know it .
Person1: Will you give me your camera ? We have to confiscate your film .
Person2:Will you forgive me . Could you return my camera ?
Person1: We will keep and return it later .
Person2:Oh , I see . Then , can I buy slides and picture postcards somewhere ?
Person1: You can buy them at the souvenir shop near the exit .
Output:
formal