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: Do you think it's time to sign the contract , Mr . Simpson ?
Person2:I'd like to look it over before I sign it .
Person1: OK , no problem . I hope there are no questions about the terms .
Person2:I am fully satisfied with the terms of this contract .
Person1: Shall we sign this contract now ?
Person2:OK . Where do you want me to sign ?
Person1: Just sign at the bottom .
Person2:OK . ( Sign ) Once a contract is signed , it has legal effect .
Person1: You're right . Thank you for your cooperation .
Person2:It's my pleasure .
Example Output: informal

Example Input: Person1: What can I do for you today ?
Person2:I need to return a book .
Person1: Can I do anything else for you ?
Person2:I want to check this magazine out .
Person1: We don ' t allow people to check out magazines .
Person2:Why not ?
Person1: It ' s just a policy of ours .
Person2:So what am I allowed to check out ?
Person1: You may check out books or videos .
Person2:I need to check out this magazine .
Person1: You will have to just read it in the library .
Person2:That doesn ' t make any sense .
Example Output: informal

Example Input: Person1: I've just been a little depressed lately .
Person2:What's wrong ?
Person1: Nothing really .
Person2:Then just keep your chin up .
Example Output:
informal