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 , Pineapple Computer Company . This is Janice Shaw , the secretary of Nova . May I ask who is calling ? 
 Person2:Good morning . This is Dan . Could I speak to Nova ? 
 Person1:        I feel so sorry that Nova has gone on her business trip . 
 Person2:Really ? When will she come back ? 
 Person1:        Maybe next weekend . She only mentioned this before she left . 
 Person2:Well , the reason why I am calling is to tell her that our appointment in next month will have to be postponed . And the exact time for this meeting will be discussed after she comes back . 
 Person1:        Wait a minute . I have to leave a memo here . Anything else ? 
 Person2:The file for the meeting needs to be retyped and please send it to us as soon as possible . 
 Person1:        Dan , don't worry . I will tell her everything as soon as she comes back . 

formal