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: You look run down , Brian .
Person2:I've been feeling under the weather recently . I caught a bad cold last week , and I still haven't got over it .
Person1: Well , you wanna take a sick leave ? All you need now is a good , long rest .
Person2:I guess so . Even though I seem to be over the worst of it . I don't want to give the bug to anyone in the office .
Person1: Good idea .
informal