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: 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 .
Example Output: informal

Example Input: Person1: Hi , my name ' s Karl . My wife and I are moving in next door .
Person2:Hello , Karl . I ' m Chuck Jones . We ' re going to be neighbors .
Person1: I ' m happy to meet you . It seems everyone in town is so friendly .
Person2:This is a small town , and we like to be neighborly . We know everyone who lives around here .
Person1: Well , I ' m from Chicago . There few people take the time to get to know their neighbors .
Person2:So , tell me , Karl , why did you come all the way to Minnesota to live ?
Person1: We wanted to live in a more peaceful community and have more space . Another reason is , we can afford to buy a home here , but we can ' t in Chicago !
Example Output: formal

Example Input: Person1: You are married to a foreigner , aren't you ? So what's it like ?
Person2:Well , in the first year of our marriage , we had great difficulties in getting along . The things that are important to me are not important to him . We had a lot of conflicts .
Person1: Yeah , I know what you mean . The first year of any marriage is difficult for all couples , not to mention two people from different cultures .
Person2:Now we have a two-year-old boy . We're very happy that he's healthy and smart .
Person1: Oh , so he's half Chinese and half American . That's unusual . What languages does he speak , then ?
Person2:Right now he speaks mostly English , and he can say a few Chinese words . But he will learn in the future .
Person1: What does he look like ? Can people tell ?
Person2:Yes , people surely can . He's whiter than the Chinese kids , and his hair is a little blonde . My husband says his eyes are very Chinese though .
Example Output:
informal