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:       Give me enough for a skirt , will you ?  
 Person2:Here you are.It ' s 90 yuan , miss .  
 Person1:        Can you give me a discount ?  
 Person2:20 percent is the best discount I can offer . That will came to 72yuan .  
 Person1:        OK . 72 yuan .  
 Person2:Thanks , Miss . I want you to see our new stock of brocade satin , a splendid line , just came in .  
 Person1:        No , Thanks.Not today .  
 Person2:I'll just have this all wrapped up for you . 

informal