Instructions: 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: Have you seen the news that there is a serious flood in the South ?
Person2:Yes . I've got to cancel my traveling plan .
Person1: What a pity ! I know you've been longing for it these months .
Person2:The only thing I can do now is waiting for another chance .
Output:
informal