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'.

[EX Q]: Person1: Professor , can you help me add your class ?
Person2:You have to bring me an add sheet to sign . Do you have one ?
Person1: No , I will have to get an add sheet .
Person2:You must take the signed add slip to the Admissions and Records Office to add the class . Do you know where that is ?
Person1: No , I don't know where that is .
Person2:The office is in front of you as you cross the quad . The signs in the hallway will tell you where you need to be .
Person1: I think I can find it .
Person2:You'll find it easily . Make sure you add the class and then we will look at the roll sheet later to make sure that you were added on .
Person1: Thank you for letting me add your class .
Person2:To drop a class , you need to do the same thing with a drop slip . Good luck !
[EX A]: formal

[EX Q]: Person1: It's four o'clock already . I hate to leave , but I think I must .
Person2:Can you stay a little longer ?
Person1: I'm sorry , but I can't .
[EX A]: informal

[EX Q]: Person1: Have you taken your temperature ?
Person2:Yes , and it is 37 C .
Person1: Well , open your mouth and let me have a look . It is nothing serious . You haven't got a fever . But you should take the medicine and need have more rest recently . When you feel well , you could take more exercises , or play sports like basketball , running , and swimming . And eating healthy food , having more fruits and vegetable and drinking milk are good for your heath .
Person2:Yes , I see . Thanks a lot .
[EX A]:
formal