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:       Hi , this is Quipu Corp . Is that Miss Zhang ?  
 Person2:Yes . speaking . Is there anything I can do for you ?  
 Person1:        I am calling to tell you the items you are supposed to bring for the interview the day after tomorrow .  
 Person2:What do I need to take with me ?  
 Person1:        You'd better bring the diploma , identification card and several copies of your resume . 

formal