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'.

Ex Input:
Person1: Have you ever seen coco ?
Person2:I've seen her on TV but not in the flesh .
Person1: I'm so familiar with her songs , but I don't know what kind of person she is in real life .

Ex Output:
formal

Ex Input:
Person1: I'm going shopping .
Person2:Do you have enough money to buy that dress ?
Person1: No . I need to borrow $ 50 .
Person2:Sure , here you go .

Ex Output:
formal

Ex Input:
Person1: Well , I can ' t believe your uncle and aunt came to stay with us for a week , and they did not even call us in advance .
Person2:John , they are old-fashioned people from the Chinese countryside . That ' s their custom .
Person1: I know , but it is hard for me to get used to your relatives coming to visit us , and without warning .
Person2:Don ' t your relatives visit other relatives ?
Person1: Yes , but Americans never visit without calling in advance , and they almost never stay overnight .
Person2:I think that maybe Chinese families are closer than your families .
Person1: I think you ' re right !

Ex Output:
formal