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:       I hear that there is a festival called Duanwu in China .  
 Person2:Yes . It is also called Dragon Boat Festival .  
 Person1:        Why are you celebrating this festival ?  
 Person2:We celebrate it to commemorate a great patriotic poet of China — Qu Yuan .  
 Person1:        What do you do on that day ?  
 Person2:We'll have rice dumplings . What's more , there are also dragon boat matches in some places of southern China .  
 Person1:        I see . 

formal