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 just heard that you won the long-distance race . Congratulations on your victory . 
 Person2:Thank you . 
 Person1:        So it is really worth your great effort . And hope you can keep the record you've made today . 
 Person2:I will try my best . 

informal