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:       Morning , Mary . I haven't seen you in a long time . What's up ? 
 Person2:Oh , I took up a new hobby . 
 Person1:        So you don't travel a lot now ? 
 Person2:No , Frank . I'm much more interested in collecting stamps now . 
 Person1:        It's certainly a popular hobby . I know a lot of people love stamps . 
 Person2:It certainly is . It's so much fun . 
 Person1:        I believe collecting stamps has something similar to traveling right ? 
 Person2:Absolutely . Through all kinds of stamps I am able to learn about the world . 
 Person1:        Well , every stamp has a story to tell . 
 Person2:You're right . And I also meet many new friends while collecting stamps . 
 Person1:        Good . 
 Person2:Sometimes we even spend hours discussing our collections . 
 Person1:        There's a lot to share when you have a common interest . 
 Person2:Yes , it's really amazing . I got to go now . I'm meeting with some other collectors . 
 Person1:        Ok , good luck . See you 
 Person2:See you , Frank . 

informal