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'.

Input: Consider Input: Person1: Are you excited about your trip next month ?
Person2:Yes and no . I can ' t wait to go to Europe , but at the same time I am terrified .
Person1: Why ?
Person2:Well , I have acrophobia . I have a chronic fear of flying .
Person1: Oh really ? I have an uncle who is also terrified of flying . It ' s not that bad though , I mean , it is pretty scary to be in this big machine flying through the air at seven hundred miles per hour . I actually have arachnophobia .
Person2:You ' re scared of spiders ? I actually have two more phobias . Acrophobia and glossophobia .
Person1: I guess that explains why you are afraid of flying , but public speaking is not that bad .
Person2:Are you kidding ? When I get on stage , my palms start to sweat , I get really nervous and I can hardly speak .
Person1: Well , I must confess I am a bit claustrophobic . I hate being in an elevator for more than 5 seconds .
Person2:We are such weirdos right ?

Output: informal

Input: Consider Input: Person1: Happy Birthday , Mary !
Person2:Thank you .
Person1: Here is a gift for you . I hope you like it .
Person2:What a lovely dog ! How did you know I love this ?
Person1: I had my own ways of finding out . It's a secret . You look so beautiful today . Your new shirt goes well with your skirt .
Person2:Maybe you don't believe it , but it was made by my grandmother .
Person1: Really ? It looks so nice .
Person2:Thank you . Please have a cup of tea .
Person1: All right .
Person2:How about some fish ?
Person1: No , thanks . I've had enough . Now , Mary , before you blow out the birthday candles , you have to make a wish . After that , you may cut the cake .
Person2:OK , let me make a wish ... Do you want a big piece of cake ?
Person1: No , just a small one . Next let's sing ' Happy Birthday ' to Mary .
Person2:It is very kind of you . I'm so moved by you .

Output: informal

Input: Consider Input: Person1: The Great Wall is a great attraction for visitors .
Person2:It's a man-made wonder . I've seen it many times in textbooks and it's part of my dream to visit it .
Person1: Someone claimed it was one of the two man-made wonders that could be seen on the moon .
Person2:That's true .
Output: informal