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: Good afternoon.Swiss Airline.Miss Grown speaking . Can I help you ?
Person2:Yes . I'd like to make a reservation to Los Angeles on Sep . 19th .
Person1: Just a moment , please . Let me check for you . ( A moment later ) Thank you for waiting . I am sorry but our flights are fully booked on that day.The next available flight leaves at 4:00 pm on 20th . Shall I reserve you a seat on it ?
Person2:Yes , please , thank you .
Example Output: formal

Example Input: Person1: One family skeleton of my family was that my younger brother has an axe to grind .
Person2:What did he aim at ?
Person1: He began to be interested in finance because he thought he would be able to inherit the family ' s fortune .
Person2:How could he have such an ill intention ? I think your father can see that through .
Example Output: formal

Example Input: Person1: I think modern painting means nothing .
Person2:I think so too . It's just pointless .
Person1: Then why are so many guys so crazy about it ?
Person2:I don't know . Maybe they're really crazy .
Person1: Maybe .
Example Output:
formal