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: I wonder if I could possibly borrow two bikes from the shop tomorrow ? I ' ll take actual care of them . I promise you .
Person2:Well . All right , Mark . Just this once . But you have to pick them up yourself . I ' m a very busy man .
Person1: Oh , that ' s all right . It ' s very kind of you . Can I come around now ?
Person2:I ' d rather you didn ' t come immediately as I said I ' m very busy at the moment . Come after lunch , Mark .
Output:
informal