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:       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 . 

informal