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:       Do you need a ticket ?  
 Person2:Surely , I do . It's hard to come by , isn't it ?  
 Person1:        Yes , it is .  
 Person2:Can you get it ?  
 Person1:        You can be assured of it . 

formal