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 Input:
Person1: Ahh ... What a fine day ! I do feel like an outdoor exercise .
Person2:How about taking a walk in the park ?
Person1: OK.It ' s delightful to have a walk in the park with the air so fresh .
Person2:Oh , it's so quiet here.We have the park to ourselves , only you and me !
Person1: Don't you see many people over there ? Just on your left .
Person2:Oh , I see them.Some are doing Taijiquan , some are performing swordplay , some are practising the Chinese Wushu .
Person1: A growing keep-fit fever is sweeping over China .

Ex Output:
informal

Ex Input:
Person1: Hello . I would like to buy some business cards .
Person2:Excellent . How many would you like ?
Person1: Two thousand would be fine .
Person2:You need to fill out this form , please .
Person1: All I want is the same thing on this card .
Person2:That will be no problem , sir .
Person1: ... Okay , I'm finished . Here's your form and my old card .
Person2:Very good , sir . Your order will be ready in one week .
Person1: Do you think you could finish it in three days ?
Person2:No problem , sir . But it will cost you extra .

Ex Output:
informal

Ex Input:
Person1: Welcome to Credit Services . How can I help you ?
Person2:Hello . I'm here to talk about my credit card . You see , I'm a corporate card holder and a personal card holder . I've had my personal credit card for ages , but my corporate one is new to me .
Person1: Right . Well , the benefits are a little different . With our Corporate Card you can use it for agency collection and payment .
Person2:Is there anything else ?
Person1: There's quite a long list , actually ! You can use if for business trip expenses , medical expenses , any internal payments .
Person2:And I suppose I can do that anywhere ? I do have to travel a lot for my job and it's such a hassle using cash and collecting all the separate receipts .
Person1: If you put it on your card , you can get an overall statement that lists all of the transactions .
Person2:In just one document ? That will definitely be a time saver .

Ex Output:
formal