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:       How is your business on the Internet , Steven ?  
 Person2:Don't mention it . I lost a bunch of money on it this year . I think it is on the brink of bankruptcy .  
 Person1:        I am sorry to hear that . It shows that you should buy companies , not ideas .  
 Person2:I changed my strategy around too . I am investing in good companies now .  
 Person1:        Yes , I agree with you . I am going to find a good company and invest in it soon .  
 Person2:It's a good idea . But please be careful when you invest this time .  
 Person1:        Yes , I will . I should learn more from you . After all I am green hand on it .  
 Person2:If you have any question , you can ask me .  
 Person1:        OK . My wife sent me a message and asked me to go home just now . I am leaving .  
 Person2:All right . Let's chat next time . Bye-bye .  
 Person1:        Bye . 

informal