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:       Mary , I will have an interview tomorrow . I am so excited !  
 Person2:Congratulations ! By the way , have you had all the things ready for the interview ?  
 Person1:        I only typed several copies of my resume .  
 Person2:That's not enough . You have many other things to prepare .  
 Person1:        What are they ?  
 Person2:Besides the resume , you also need the original and copies of your graduation certificate and your ID card .  
 Person1:        I see  
 Person2:Also several copies of your one-inch color photos .  
 Person1:        Yes , I have those .  
 Person2:You also need to prepare formal clothes for the interview ; a suit should be the best .  
 Person1:        I will get it soon .  
 Person2:Have a briefcase ready with all your interview materials in it for easy carrying .  
 Person1:        Ok , I will remember .  
 Person2:All these should be enough . Good luck ! 

informal