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 Wei , what are you going to do this weekend ? 
 Person2:I think I ’ ll stay in on Saturday and rest . 
 Person1:        Oh right ... How about Sunday ? 
 Person2:Ah , I ’ m going to the pub to watch the football . 
 Person1:        Oh really ? I ’ ll come along with you if that ’ s ok . 
 Person2:Sure , you ’ re more than welcome . I ’ m meeting everyone at three o ’ clock . 
 Person1:        Oh great , I ’ ll see you there ! 

informal