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'.

Example Input: Person1: There has been talk at school about canceling the concert .
Person2:Really ? Who did you hear that from ?
Person1: Just word of mouth .
Example Output: informal

Example Input: Person1: Have you run into your cousin Jimmy lately ?
Person2:As a matter of fact , I have . I ran into him just the other day .
Person1: How's he doing ?
Person2:Not too well . He had to have four teeth pulled last week .
Person1: He did ? That's too bad !
Person2:I think so , too .
Person1: Next time you see him , please tell him I'm thinking of him .
Person2:I'll be sure to do that .
Example Output: informal

Example Input: Person1: You look tired .
Person2:Yeah , I ' Ve been working so much overtime lately .
Person1: Really ? How come ?
Person2:My boss gave me a big project . I had to have it finished it by this morning . It was so difficult !
Person1: You shouldn ' t work so hard .
Person2:I know . But hard work pays off , you know .
Person1: What do you mean ?
Person2:Maybe now I ' ll get that promotion I was hoping for .
Example Output:
informal