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: Is there a bookstore near here ?
Person2:Yes , it's straight ahead around the corner .
Person1: Thank you very much .
Example Output: informal

Example Input: Person1: Lester , you are really fantastic at automobile repair .
Person2:Thanks , June . But I think I need to be certified as a mechanic before I ' m allowed to repair cars for a living .
Person1: That ' s not a big problem . There are many small schools for adults like you who can study to be certified .
Person2:I guess I never thought of that before .
Person1: And you can easily get a student loan from a vocational school , or from the government .
Person2:Wow , you ' Ve inspired me to do something !
Example Output: informal

Example Input: Person1: Do you have any particular hobbies , Tom ?
Person2:Oh , yes . I love playing badminton , table tennis and computer games . And playing the games has become my favorite .
Person1: I hear many teenagers will spend hours and hours sitting at computers . And they don't care about their own health at all . How about you ?
Person2:I'm no better than them . They say it's mindless to sit in front of a machine all the time , but I think it's stimulating .
Person1: You won't play online games full of violence , will you ?
Person2:Once in a while .
Person1: It's no good . And I think spending several hours each day playing computer games is a waste of time . You might as well do something healthy and meaningful .
Person2:I hope I can practice self-control again .
Example Output:
formal