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:       Hi , buddy ! How do you deal with your salary ? 
 Person2:I usually put them into my bank account . I think that is a little secure , though the interest rate is low now . 
 Person1:        Look ! This stock is rising now . I am researching it , and planning to buy some shares . 
 Person2:Have you invested in the stock market before ? 
 Person1:        No . This is my first time to buy some . You can see that its historical price data is rising now . 
 Person2:But that is a little risky , you know . 
 Person1:        Hey ! Do you still remember our teacher of economics , Mr . Locker ? 
 Person2:Of course ! I remember he has a part-time job as a stock analyst . 
 Person1:        I can ask for some advice from him . 

informal