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 know you're sleepy and I hate to bother you , but I think you're late for work .
Person2:Oh , no . I forgot to turn the alarm clock on !
Person1: Don't worry . I can give you a lift .
Person2:Thank you . You save me .
Output:
informal