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: Would you like any toast , dear ?
Person2:Um ?
Person1: Toast , dear ?
Person2:As you like .
Person1: Would you like any tea , dear ?
Person2:It doesn ' t make any difference to me .
Person1: Oh , you ' re not listening to me .
Person2:Leave me alone .
formal