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:       Are you going anywhere for your vacation ?  
 Person2:Yes , we're making plans for a tour .  
 Person1:        That'll be lovely . Where are you going ?  
 Person2:Well start out from Long Island this Friday . We've planned a four day drive to Salt Lake City , where we'll join my brother and his family on his fortieth birthday .  
 Person1:        Well , you've got to prepare a lot of food and enough sleeping bags then .  
 Person2:Oh , we'll spend the nights in hotels and enjoy local food as we pass by . How does it sound , David ?  
 Person1:        It sounds good . You can do a lot of sightseeing , too .  
 Person2:Yes , we'll take our time . And we'll go to Five-lake Strict and the Wall Street .  
 Person1:        So , you're going to have a really nice vacation .  
 Person2:You can say that again . 

informal