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: I'm going to America .
Person2:Any idea when you'll leave ?
Person1: I hope before the end of the month .
Person2:Let me know when you find out .
Example Output: formal

Example Input: Person1: Will you bring our bill , please ?
Person2:Yes , certainly . I'll be back in a minute . Here you are
Person1: Thanks.Let me see . I think there's a mistake on the bill here.Would you mind checking , please ?
Person2:Of course , not.Let me check.Oh , you seem bo be correct .
Person1: How about tax and service charge ?
Person2:Only ten percent tax is included in the bill .
Person1: Then one hundred U . S . dollars covers everything , doesn't it ?
Person2:It sure does .
Example Output: informal

Example Input: Person1: Get up , it's time for you to get ready .
Person2:Let me just get five more minutes of sleep .
Person1: I would , but you need to start getting ready for school .
Person2:I understand , but all I want is five more minutes of sleep .
Person1: If I let you go back to sleep , I know that you won't get up in five minutes .
Person2:Trust me . I'm going to wake up .
Person1: You have a lot to get done this morning .
Person2:I already know , and I'll take care of all that when I wake up .
Person1: I want you to be on time for school today .
Person2:I'll make it to school on time . Don't worry .
Person1: Okay , I'll let you sleep for a little while longer .
Person2:I really appreciate that .
Example Output:
informal