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 do you want for your birthday from your parents ?  
 Person2:I don't know . Maybe a pair of new shoes .  
 Person1:        Why don't you ask them to buy you a PC ? You will soon use it at college .  
 Person2:That's a dandy idea . Thank you for reminding me . 

informal