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:       Excuse me , could you spare me a few minutes ?  
 Person2:Yes , certainly.How can I help you ?  
 Person1:        Do you know if train 10 is on time to be here ?  
 Person2:Sorry , I don ’ t know . I ’ m a passengers ’ m waiting for my train ..  
 Person1:        Do you mind if I read your newspaper for a while ?  
 Person2:Certainly not.Here it is .  
 Person1:        Thanks a lot 

informal