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'.

Input: Consider Input: Person1: Mom , you know that Andrea and I sometimes worry about you .
Person2:Really ? Why would you worry about me ? I ' m just fine .
Person1: You ' re almost 70 years old , Mom ! Don ' t you think it would be better for you if you moved in with us ?
Person2:No way ! I like my apartment , and I like to be independent .
Person1: Do you ever get lonely living alone ?
Person2:Not at all . I see you and your family twice a week , and I enjoy seeing my own friends . I ' m too busy to feel lonely !

Output: informal

Input: Consider Input: Person1: Mom , have we got any cookies ?
Person2:Cookies ? You just ate an hour ago .
Person1: I know , but I'm hungry .
Person2:Well , why don't you have some fruit instead ?
Person1: Aw , Mom . I don't want fruit , Aren't there any chocolate chips ?

Output: informal

Input: Consider Input: Person1: Are you ready to order now , sir ?
Person2:Yes .
Person1: Would you like an appetizer ?
Person2:Yes . I'd like a crab cocktail .
Person1: Would you like some soup first ?
Person2:Very well .
Person1: What kind of soup would you like ?
Person2:I want egg soup .
Person1: Have you decided on anything ?
Person2:I'd like to have some meat .
Person1: How about stewed-fried steamed pork ?
Person2:No , thank you .
Person1: Are you interested in today's special ?
Person2:What is it ?
Person1: Twice cooked spicy pork slices .
Person2:OK . Let me try it .
Person1: Anything else ?
Person2:No , thank you
Output: formal