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:       I need to get some business cards printed up .  
 Person2:Do you know how many you need ?  
 Person1:        I think I can get by with 2,000 .  
 Person2:We can get started as soon as you fill out this form .  
 Person1:        I hope you can make the new cards just like my old cards .  
 Person2:You won't be able to tell the difference with a magnifying glass .  
 Person1:        ... Okay , I'm through . Here's the form and my old card .  
 Person2:Very good . You can pick up your order in one week .  
 Person1:        Now that I think of it , three days is better than seven .  
 Person2:We can do that , but you'll have to pay a little extra . 

informal