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:       Why , Tom ? It's five to six already and you are still writing here .  
 Person2:So what ? Are we going anywhere ?  
 Person1:        Yes , have you forgotten ? We have arranged to go to Mary's to watch some videos tonight .  
 Person2:Oh , I'm sorry I forgot all about it.Well , can I take a rain check ?  
 Person1:        What's the matter with you ? You are the one that persuaded all of us to go there .  
 Person2:I'm terribly sorry , Rose.But I have to finish this paper by tomorrow or professor Martin will kill me . 

formal