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:       What can I do for you ?  
 Person2:I need some medicine .  
 Person1:        For whom ?  
 Person2:My younger brother . He suffers from a bad cold .  
 Person1:        What symptoms does he have ?  
 Person2:Fever and a bad cough .  
 Person1:        I got it . Don't worry , just a common cold .  
 Person2:What kind of medicine does he need ?  
 Person1:        Patulin will do .  
 Person2:How many pills for each time ?  
 Person1:        Six per day , and two after each meal .  
 Person2:Thank you very much .  
 Person1:        My pleasure . 

informal