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:       Accounting , this is Mike .  
 Person2:Mike , this is Leo in Sales . I was just calling to confirm our meeting tomorrow.Are we still on ?  
 Person1:        Goodness ! It ’ s been so long I actually forgot . Let me see ... yes , it is on my calendar .  
 Person2:OK . See you at your office at 2:30 .  
 Person1:        Right , see you then ! 

informal