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:       morning , Mr . Winthrop . This is Sally Parker , Mr . Emory ’ s secretary . Mr . Emory has asked me to set up a meeting with you .  
 Person2:Certainly , Miss Parker , Let me get my book . My secretary ’ s out and I can ’ t keep anything straight !  
 Person1:        I understand . Would you like me to call you back ?  
 Person2:No – That ’ s all right . How about the 30th at 4:00 p . m . ? – Is an hour enough ? 

informal