Given the task definition and input, reply with output. 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'.

Person1: Good evening , I have a reservation under the name of Tomlinson .
Person2:Ok I ' Ve found it . Checking out on the 27th ?
Person1: That ' s right .
Person2:Can I take a credit card for the deposit ?
Person1: Yes , sure . Also , I ' d like a non-smoking room please .
Person2:Certainly madam . Here ' s your key . Your room is on the 7th floor and on the left . Room 781 . Check out is at 12 noon .
formal