Given the task definition and input, reply with output. 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'.

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