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:       John , you have done a good job . Our new series computer is appreciated by the guests . They intend to sign contracts with our company . You really did a good job .  
 Person2:Thank you . I can't imagine the design of the new computer is so popular among computer users .  
 Person1:        Hah , as the sale department director of our team , you are the best .  
 Person2:I am flattered . But I am not sure whether the manager is satisfied with it . She asked me to her office .  
 Person1:        Why not ? You've done so well for the company . She should give you a prize .  
 Person2:I feel nervous when I face her . She looks so serious when we have a conversation all the time .  
 Person1:        Come on ! What are you nervous about ?  
 Person2:It is said that the sales for the new computer did not meet the expectation .  
 Person1:        But the sale number is close to the predicted amount .  
 Person2:I'm still nervous . I don't know what to say to the manager . I always feel ill at ease in that kind of place .  
 Person1:        Take it easy . Be confident . I'm sure you can do it . 

informal