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:       This skirt is too tight . I would like to return it please . Do I need to go to the customer's service desk ?  
 Person2:I can help you with that . Do you still have your receipt ?  
 Person1:        No , I receive this as a birthday present , but the price tag is still on the skirt though . Will that be OK ?  
 Person2:Oh , yes , that will help me a lot .  
 Person1:        Do you have any more skirts in this style ? I would like to find a size larger .  
 Person2:I'm sorry . I think we're out of this skirt in this color . Do you want me to call another one of our store to see if it's available there ?  
 Person1:        No , that's all right . I'll just look for something else .  
 Person2:Well , your refund total is 50 dollars . 

informal