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: Consider 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 .

Output: informal

Input: Consider Input: Person1: Is the environment a big issues in your country ? It is in mine .
Person2:It is in mine too.The biggest issue is water . The climate is dry and so water conservation is very important .
Person1: What methods do you use to conserve water ?
Person2:Water is rationed . We can only use a certain amount each month . It means that we cannot use some modern household items , like washing machines . They use too much water .
Person1: I see . I think the biggest environment problem in my country is air pollution .
Person2:Yes , I agree . The air here is much more polluted than in my country . Of course , my country is more agricultural and has much less industry .
Person1: We have reduced emission of air pollutants in recent years , but cars are still a major source of them . Factories have become cleaner as stricter environment pollution law have been introduced .
Person2:The problem is now on a truly global scale . I don ' t believe that any single country can do anything about it .
Person1: I think you ' re right . There needs to be an international response to this problem .

Output: formal

Input: Consider Input: Person1: Do you have a bf ?
Person2:Yes , I had a bf before .
Person1: Why you say bf before ?
Person2:We parted from each other last month .
Person1: Have you got a new one ?
Person2:Mmmm , no . How about you ?
Person1: I am single , I have no real of , only an E-gf , that is you .
Person2:Haha , so you are my E-bf .
Person1: I like you . Do you agree to be my of ?
Person2:Mmmm . .. OK , let's try to be .
Person1: Wow ! Blablablabla . . .
Person2:Hey ! What is it ?
Person1: I am flying like a bird .
Person2:LL
Person1: I am so happy . I want to drink a cup of champagne .
Person2:I have no champagne right now . How about this ?
Person1: It's OK , so I send you this .
Person2:Is it made of chocolate ?
Person1: It's my heart ; it's made of what you like .
Person2:Oh , I will have a sweet dream .
Person1: Are you sleepy ?
Person2:A little bit . I have to go to sleep though I don't want to .
Person1: Yes , I do not want to see ur sleeping in the office .
Person2:Thx.Bye for now . Kisssssssssss .
Person1: C U here , honey .
Output: informal