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:       May I help you ? 
 Person2:Yes , I would like to return these slacks . 
 Person1:        Alright . Do you have your receipt ? 
 Person2:Yes . Here it is . I bought them last week . 
 Person1:        And why are you returning them ? 
 Person2:I bought them to go with a blouse of mine . But they don't really match . 
 Person1:        I see . Oh , wait . Ma'am , I'm sorry . These slacks were on sale . 
 Person2:Yes , they were thirty percent off . 
 Person1:        I'm sorry , but we don't allow returns on sale items . 
 Person2:I know many stores have that policy . But I have returned sale items here before . 
 Person1:        I'm sorry , but we usually don't do it . It is our policy . 
 Person2:I just bought these slacks a week ago . And I am a regular customer here.Can you make an exception this time ? 
 Person1:        Well . Let me talk to the manager for a moment.Ma ' am , the manager says I can do it this time . 
 Person2:Good . I'm a regular customer here . I am glad you can make an exception for me . 
 Person1:        Please show me your receipt again . 
 Person2:Here it is . 
 Person1:        I will have to give you store credit , Ma'am . If you find something else you like in the store , you can use the credit . 
 Person2:Store credit is okay with me . I'm sure I will find something I like . I shop here a lot . 
 Person1:        We appreciate your business , Ma'am . 

informal