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:       Can I help you ? 
 Person2:I hope so . I'm looking for some material for a paper I'm writing , and I'm not quite sure where to look . 
 Person1:        I'll certainly try to help you.What topic is your paper on ? 
 Person2:My paper is on the influence of television on children . 
 Person1:        There are several possible sources you might use for that topic . I suggest you use the computer and the computer will give you a list of every scientific journal that talks about children and television . 
 Person2:Thank you for you help . 

informal