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:       Hi there , I'm Steve Saunders.What ' s your name ?  
 Person2:I'm Patti Whitney.Isn ' t this convention great ?  
 Person1:        Yes it is , better than I expected it would be.The presenters have been first rate.Is this the first conference you've been to ?  
 Person2:No , I've been coming for the last 3 years.Each year keeps getting better.Where are you from ?  
 Person1:        I'm from Long Island , New York.What about yourself ?  
 Person2:I'm from the other side of the coast--Los Angeles .  
 Person1:        Wow . I really like California ... the weather there is much better than the East Coast .  
 Person2:Have you been to California ?  
 Person1:        Just once.Quite a few years ago we took the kids to Disneyland on our vacation.They had a blast .  
 Person2:How many kids do you have ?  
 Person1:        Two , a boy and a girl.They ’ re already grown now .  
 Person2:Well , California ’ s changed over the last little while.You should come back out sometime . 

informal