Detailed Instructions: 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: Look what you've done !
Person2:I'm very sorry , sir . I'll bring you a cloth immediately .
Person1: Yes , and hurry up !
Person2:I'd like to apologize for my carelessness . May I clean it up for you ?
Person1: No , I'll do it myself .
Person2:Here is my card , sir . Could you send me the cleaning bill and I will refund the cost to you ?
Person1: I should think so , too !
Person2:I'm very sorry to have caused you this trouble .
Person1: Yes , and please be more careful in the future !
Person2:I will , sir . I'm really very sorry .
Person1: That's OK .
A:
informal