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'.
Q: 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 .
A:
informal