Definition: 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:  Person1:       Wow ! What a beautiful scenic spot . It's so open . And just breathe that fresh air , you can almost taste its freshness . 
 Person2:You can have a bird view of Chilin City from the top of the mountain . 
 Person1:        Wonderful ! I'll often come here for mountain climbing . 
 Person2:You should . Many Guiliners , especially the old and the young , will climb mountains here in the coming . 
 Person1:        No wonder people say , Even the immortals would rather be Guiliners . 
 Person2:... Quick ! Pass me your binoculars . Look at that bird ... I've never seen one of those before . It's indigenous to Guiling , and an endangered species too . This is lucky . 
 Person1:        I didn't know you liked bird watching . 
 Person2:I don't really . I just like wildlife , and you don't get to see too much of it in the city . This place is full of it . 

informal