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 want to open a saving account , sir . What's the proper procedure ? 
 Person2:First , you fill out the application form and then we'll issue you a passbook . 
 Person1:        Is there any minimum for the first deposit ? 
 Person2:No , Even a dollar is all right . Here's your passbook , sir , just sign your name on it . 
 Person1:        What is the annual interest rate ? 
 Person2:It varies from time to time . At present it is 6 % . 
 Person1:        By the way , can I open a checking account too ? 
 Person2:By all means . But you have to deposit enough money before you can write out your checks . 

formal