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:       Do you know who Ammo Hung is ?  
 Person2:Of course . He is now 50 years old . And he started out studying alembics , singing , dancing and martial arts at the age of nine , and has tarred in 140 kung fu films . He has also become an independent producer and director .  
 Person1:        You know only one aspect of him . Do you know what he would do in the kitchen ?  
 Person2:I have no idea . Tell me .  
 Person1:        In the kitchen , with his wife by his side he still puts on quite a dinner time show .  
 Person2:What does he do there ?  
 Person1:        Imagine a chef chopping vegetables on fast forward . Picture a man making a stir-fry , tossing the mixture up in the air , and then catching it , every last bit , in his work . And his culinary motto is ' Enjoy the moment . ' If you want to know hey theycook , visit www.StudioClassroom.com.tw for the recipe . 

formal