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:       Could you help me prepare for my presentation on Friday ? 
 Person2:I would love to help you prepare for your presentation . 
 Person1:        I hate to ask you to do something like that . 
 Person2:This will not interfere with my work . I promise you that . 
 Person1:        When could we get together ? 
 Person2:I could easily give you some time tomorrow night . 
 Person1:        Would you like to meet me at the coffee house next door ? 
 Person2:Yes , and could you write down anything you might be having trouble with ? 
 Person1:        I'll come prepared . 
 Person2:Goodbye until then . I promise you that you'll do well after we meet . 

informal