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:       Where are you going this weekend ? 
 Person2:I have no idea . Maybe I will sleep for the whole day . 
 Person1:        So boring ! Shall we go out for a picnic with my friends ? 
 Person2:Sounds interesting . Who are the other people ? 
 Person1:        Fred and David , my college class mates and Rachel . 
 Person2:Gorgeous ! What should I bring on that day ? 
 Person1:        Your tent and enough food and water . 
 Person2:You mean , we can do many other things after the picnic , right ? 
 Person1:        We can go fishing , chatting and camping . 
 Person2:What are we waiting for ? Come on ! 
 Person1:        Don't hurry . Wait for my call . 

informal