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: I want to change rooms immediately , plus a refund for tonight .
Person2:I'm sorry , sir . Exactly what is the problem ?
Person1: I'm knee-deep in cockroaches !
Person2:I'm so sorry , sir . We'll give you a new room immediately , and give you a refund also .
Person1: Thank you . I'm glad that this hotel strives to keep its reputation intact .
Person2:Sir , we always try to please our guests .
A:
formal