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'.

Example Input: Person1: How did Jim get the money ?
Person2:He borrowed it from Nick .
Person1: He must be mad ! Nick is a loan shark .
Person2:He was too desperate to find some other way .
Example Output: formal

Example Input: Person1: Is there a train leaving for Philadelphia ?
Person2:Yeah . There's an express that leaves in twenty minutes .
Person1: May I buy a ticket here at the station ?
Person2:Sure .
Person1: Where ?
Person2:Go to window number eleven .
Person1: Thanks .
Example Output: informal

Example 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 .
Example Output:
informal