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: Tony looks very handsome in the suit .
Person2:He prefers suits to jackets .
Person1: Judge from his look , he's a very serious person .
Person2:As a matter of fact , he is .

Output: informal

Input: Consider Input: Person1: Hello , Lily .
Person2:Hello , Mr . Clark . You ' re early for lunch . It ' s only eleven o ' clock .
Person1: When I come late , there ' s usually nothing left .
Person2:What would you like today ?
Person1: I ' ll have the leg of lamb .
Person2:And would you like salad ? The salad plate today is lettuce , tomatoes , and black olives .

Output: formal

Input: Consider Input: Person1: Hi , Mrs . Henderson .
Person2:Hi , Steven . Do you have time and chat with me ?
Person1: Of course I have plenty of time . What's new ?
Person2:The new couple next door divorced . Have you heard about it ?
Person1: No . The Hills ? Who filed for divorce first ?
Person2:I guess it Is Mrs Hill . She sued for divorce on the grounds of her husband's misconduct with his secretary .
Person1: Oh , maybe not . It's just your guess . Do not give currency to idle gossip .
Person2:OK . I close my mouth .
Output: informal