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 need to find somewhere to park .  
 Person2:Off campus or on campus ?  
 Person1:        I need to find a space on campus .  
 Person2:Why don't you park in the parking structure for students ?  
 Person1:        Where is the parking structure at ?  
 Person2:It's on the west side of the campus .  
 Person1:        Do you know if the parking structure is full or not ?  
 Person2:It was empty last time I went up there .  
 Person1:        How long ago was that ?  
 Person2:I went up there early this morning .  
 Person1:        Do you think it'll be full now ?  
 Person2:It might be . You'll have to go see for yourself . 

formal