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:       Brian , a company called me for an interview .  
 Person2:That's great ! You need to prepare for it .  
 Person1:        How ?  
 Person2:Get your hair done at a good hair saloon . Tell them you are going for a job interview .  
 Person1:        Okay .  
 Person2:Buy an expensive suit .  
 Person1:        How expensive ?  
 Person2:The more expensive , the better .  
 Person1:        I can ’ t afford too expensive , maybe $ 50 to $ 70 ?  
 Person2:That'll do it . The best way is to find the dressing color code of the company .  
 Person1:        How ?  
 Person2:If you know somebody at the company , ask them . If not , dark color will be fine .  
 Person1:        Is a white blouse okay ?  
 Person2:Yeah , fine . And dressing shoes .  
 Person1:        Black ?  
 Person2:Black is good .  
 Person1:        White pantyhose ?  
 Person2:No . Dark or skin colored .  
 Person1:        Jewelry ?  
 Person2:Necklace , ring , and earrings are all fine . But don ’ t wear too many pieces of jewelry .  
 Person1:        How about make up ?  
 Person2:Not much make up .  
 Person1:        Perfume ?  
 Person2:Yes , some . But be aware that different people may like different scents . 

informal