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: Hello , Jill .
Person2:Tom , You're back , come in please.How are you ?
Person1: Fine , only a little tired .
Person2:You'll recover after a good night's sleep .
Person1: Thank you very much for looking after my house in my absence .
Person2:That's all right.Would you have a cup of coffee ?
Person1: Yes , Please.It ' s very kind of you .
Person2:Don't mention it .
Person1: The rooms are very tidy and the flowers grew very well.You are very helpful . I want to thank you for everything you've done for me .
Person2:It's my pleasure .
Person1: I bought you some books on literature , I don't know if you would like them .
Person2:Thank you.Thank you for the trouble you've taken .
Person1: Not at all .
informal