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:       May I have two tickets for Tiny Times ?  
 Person2:OK . What time ?  
 Person1:        2:30 , please .  
 Person2:It's 60 yuan , please .  
 Person1:        Sorry , we have student cards . We can get discounts with these , can't we ?  
 Person2:Sure . That'll be 40 yuan , please .  
 Person1:        Here is 50 yuan . 

formal