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: It's said you will go abroad to pursue your graduate studies .
Person2:Yes , I've been thinking about visiting you . I hope to get some advice from you .
Person1: Which country do you want to go to ?
Person2:My field is electronic engineering . Which country do you think I should go ?
Person1: Were I in your position , I'd go to America .
Person2:Which university should I apply to ?
Person1: There are many universities for you to choose from . Some famous universities such as Harvard , Yale , the University of Michigan , and Massachusetts Institute of Technology are really wonderful places to study , but they are very competitive and expensive . Some smaller universities or institutes are also very nice but much cheaper .
Person2:Oh , I see . Thank you very much .
Example Output: formal

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: Susan has got the cancer of stomach .
Person2:How terrible ! This is quite unexpected !
Person1: Yesterday when I went to hospital to see her , you cannot imagine how greatly surprised when I saw her .
Person2:What happened ?
Person1: Because of atomic cocktail and other medicines , all of them have the side effect . she has lost all her hair .
Example Output:
informal