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 ? 
 Person2:Good morning , Nathaniel . This is Leah calling from the International Student Office . 
 Person1:        Good morning . 
 Person2:The reason I'm calling is because Ms . Collins will not be able to call you back until next week . 
 Person1:        Oh . I had hoped she would have called me back yesterday . 
 Person2:She's terribly sorry about that . She had to leave the office suddenly and won't be able to return until next week . She hopes you understand . 
 Person1:        Is there someone else I can talk to ? 
 Person2:She asked me to call you to book an appointment with someone else today . When are you free today ? 
 Person1:        Any time after 2 pm today would be good for me . 
 Person2:Mr . Liu is available at 2:15 today . Will that work for you ? 
 Person1:        I'd prefer to speak with Ms . Fonda . 
 Person2:I'm afraid she isn't available this afternoon . She has an opening at 11:30 this morning . Will that work for you ? 
 Person1:        That will be fine . 
 Person2:Ok , we'll be expecting you at 11:30 then . See you then . 

formal