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'.

Ex Input:
Person1: So , what happened ?
Person2:He never came .
Person1: He stood you up .
Person2:I wouldn ' t exactly characterize it in that way . I think something happened . Something terrible and unexpected that made it impossible for him to ... what if he showed up , took one look at me and left ?
Person1: Not possible .
Person2:Maybe , there was a subway accident .
Person1: Absolutely .
Person2:A train got trapped underground with him inside .
Person1: And no phone .
Person2:And you know , how those express trains create suction .

Ex Output:
informal

Ex Input:
Person1: Good afternoon . Reservations . May I help you ?
Person2:Yes , I'm calling from Tenga Company . I'd like to know if you have rooms available for the nights from October 8 to October 12 . We are going to have a business conference .
Person1: May I ask how many people there will be in the party ?
Person2:20 persons .
Person1: What kind of room would you like ?
Person2:Double rooms with twin beds .
Person1: A moment please , sir . Yes , I can confirm 10 rooms for those days .
Person2:Thank you . Is there a special rate for a group reservation ?
Person1: Yes , there is a 10 percent discount .
Person2:That is fine .

Ex Output:
formal

Ex Input:
Person1: You really look familiar .
Person2:Really ? My name is Gretchen Hammer . What is your name ?
Person1: My name is Phillip Hammer . I think we are related . Who is your dad ?
Person2:Jacob Hammer . He is originally from Holland .
Person1: That's my uncle . You're my cousin ! Hi cousin !
Person2:It's really a small world , isn't it ! The Hammer family isn't very big .
Person1: It really is . Do you have time to eat dinner and catch up ?
Person2:I always make time for family .

Ex Output:
informal