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:       I'd like to make an appointment with manager Mr.Wu . Would 10:00 a . m . tomorrow be all right ?  
 Person2:I'm afraid not . He has a meeting tomorrow morning .  
 Person1:        Could I possibly make it early in the afternoon ?  
 Person2:No , that's not good either . But give me your phone number and I'll call you if somebody cancels .  
 Person1:        Thank you very much . 

informal