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: But Sue is indeed beaut . Men can hardly resist such a knock-out .
Person2:Birds of feather flock together . You must be one of these men .
Person1: I know little of her . I only think she ' s pretty and intelligent . Of course , she ' s diligent , too .
Person2:That ' s enough for you to worship the ground she treats on .
Example Output: 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: Can I help you , ma'am .
Person2:Yes , will you keep our bags until 6 p . m . ?
Person1: Are you all our guests ?
Person2:Yes , we checked out just now .
Person1: Please fill in this form .
Person2:Is this all right ?
Person1: So you are leaving this evening.We keep your bags until 6 p . m . Here's your tag .
Person2:Thanks a lot .
Example Output:
formal