Definition: 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'.
Input:  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 . 

formal