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:       How may I help you ? 
 Person2:I would like to return an item . 
 Person1:        What are you returning ? 
 Person2:I want to return this cellphone . 
 Person1:        Is there a problem ? 
 Person2:It's broken . 
 Person1:        What exactly is wrong with it ? 
 Person2:The phone turns off by itself . 
 Person1:        That's fine , but do you have your receipt with you ? 
 Person2:Yes , here it is . 
 Person1:        I'll refund your money right now . 
 Person2:Thank you so much . 

informal