Given the task definition and input, reply with output. 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 am past my stop . Would you please let me get off ?
Person2:I am sorry . It's not allowed . You have to wait till the next station .
Person1: Well , that's OK .
Person2:Can you please slow down ? I am not in a hurry .
Person1: OK .
informal