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:       I want to buy a parking permit , please .  
 Person2:Are you a full-time student or do you attend part-time in the evenings ?  
 Person1:        I attend both day and evening classes .  
 Person2:Will you be riding a motorcycle or do you drive a car ?  
 Person1:        I ride a motorcycle .  
 Person2:That permit will run twenty-five dollars ; will that be cash or credit card ?  
 Person1:        I'll use a credit card , thank you .  
 Person2:Do you need a second permit for a car ?  
 Person1:        No , just the motorcycle permit .  
 Person2:Fine , here it is and have a great semester ! 

formal