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: Tom , you promised to cut the lung . You won't forget , will you ?
Person2:No , I assure you .
Person1: And you'll repair the television , won't you ?
Person2:Ok .
Person1: Do you promise ?
Person2:Of course .
Person1: And Tom , you will help Johnny with his homework , won't you ?
Person2:I'll see . I will if I can but I won't promise .
Person1: But you'll promise not to be late for dinner tonight , won't you ?
Person2:Yes . But only if you ask me nicely .
Person1: Tom , darling . You'll try not to be late for dinner tonight , won't you ? Please !
Person2:Ok . I'll keep my promise .
A:
formal