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:       Can we have two tickets for seven thirty ?  
 Person2:Yes , and would you like to have seats in the front or at the back ?  
 Person1:        In the front , please .  
 Person2:That's 35 yuan each .  
 Person1:        Thank you . And what's on tomorrow ?  
 Person2:Tarzan .  
 Person1:        Can we get tickets now ?  
 Person2:I am afraid not . Tomorrow is premiere . 

formal