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:       Hey . Owen ! Have you gone on your family vacation yet ?  
 Person2:Oh , yes . I got so tired . My son began to cry the moment we got on the train . It was very embarrassing because we took the over-night train and the noise made it difficult for other people in the cabin to sleep .  
 Person1:        Didn't you bring his favorite toy ?  
 Person2:Yes , we did . Fortunately we put his Teddy Bear in the bag , and finally he fell asleep at mid-night with it in his arms .  
 Person1:        Where did you go ? You've got a beautiful tan .  
 Person2:My wife didn't like to go to amusement parks , so we compromised and finally went to the seaside . I think vacation in summer is not good .  
 Person1:        You must have had a great time . Most children love to play in the sand on the beach and go swimming .  
 Person2:Yes , he was every excited to see the blue sea and picked up many seashells to give as gift for his classmates in kindergarten .  
 Person1:        His friends will be very happy to get the little souvenir .  
 Person2:And I taught him how to swim in the sea . It was fun and made him braver than before . After we returned home , he wasn't afraid to sleep alone in his bedroom . 

formal