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:       Hello . This is Doctor Bell ’ s Office . Can I help you ?  
 Person2:Hi . This is Taylor Wright calling . I ’ Ve got an appointment with Doctor Bell at 9.00 tomorrow morning . I ’ Ve got to cancel this appointment . My father-in-law passed away suddenly last night .  
 Person1:        I ’ m sorry to hear that . Cancelling the appointment is no problem . Thank you for your call .  
 Person2:Thanks a lot . Good bye . 

informal