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: My god , it's such a lovely lake ! The lake has a water surface of 56 square kilometers .
Person2:No wonder it looks so huge .
Person1: We are now walking on what is in fact an island . Here we get one of the 10 sceneries of the West Lake , Autumn Moon over the Calm Lake .
Person2:Why is it called Autumn Moon over the Calm Lake ?
Person1: It's so named because in the pavilion over there the great poet Bai Buyi of the Tang Dynasty would take a rest after drinking a little too much , and watch the moon over the lake .
Person2:Very romantic .
Person1: Now let's board the boat and have a ride on the lake .
Person2:Sure ( They get on the boat ) .
Person1: Wang , what's that building over there ? It looks like some sort of a huge pavilion .
Person2:You are right . That's the Heart of Lake Pavilion , situated on an islet.It was built in 1552 and is the largest pavilion on the West Lake . Oh , here we are at the Little Yingzhou island . Let's get off the boat . Please watch your steps .

Output: informal

Input: Consider Input: Person1: How do you spend your free time ?
Person2:I read or go swimming , go shopping , usually . I run or play tennis or do something else like those to get some exercises to keep fit .
Person1: Are you introverted or extroverted ?
Person2:I wouldn't call myself extroverted . Sometimes , I enjoy being by myself very much . But other times , I like sharing activities with others too , especially during these last few years .
Person1: What kinds of sports do you like ?
Person2:I like almost all sports , and I enjoy both playing and watching . I especially like tennis and mountain climbing .
Person1: What kind of personality do you think you have ?
Person2:Well , I approach things very enthusiastically , I think , and I don't like to leave something half-done . It makes me nervous-I can't concentrate on something else until the first thing is finished .

Output: formal

Input: Consider Input: Person1: Hello ?
Person2:Hi Steve . This is Mike . What are you doing ?
Person1: Oh , hi . I was just watching TV .
Person2:There's nothing to watch right now .
Person1: I know . I was watching a re-run . I have nothing to do and I was bored .
Person2:Me too . Let's get together and do something .
Person1: I'd like to , but I have to meet my parents in an hour for dinner . How about tomorrow ?
Person2:Yeah . Let's plan something tomorrow .
Person1: Did you hear the weather forecast for tomorrow ?
Person2:I think it is going to be the same as today . Clear and sunny .
Person1: That's great . We can do something outdoors then .
Person2:Are there any special events going on tomorrow ?
Person1: Yeah . I think there's a live outdoor concert by the river tomorrow .
Person2:Oh yeah . I heard about that too . Let's go check it out .
Person1: Do you know what time it starts ?
Person2:It starts at one PM .
Person1: Let's meet for lunch at eleven thirty and afterwards , we can head over there .
Person2:Perfect . I'll see you in front of the apartment at eleven thirty .
Output: informal