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:       Could you please cover for me two hours this morning ?  
 Person2:Sure . Any specific reason I should know about in case people ask where you are .  
 Person1:        I have to see the dentist . We have an appointment for this morning from 9 to 11 o ’ clock . So if there is any phone call , please pick up for me . If there is something urgent , tell them I will be back in two hours .  
 Person2:No problem . Good luck .  
 Person1:        Yes , I will need it . Thanks . 

informal