You will be given a definition of a task first, then some input of the task.
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'.

Person1: I want to open an account .
Person2:What kind of account do you want to open ?
Person1: I want to open a checking account .
Person2:Do you know the minimum balance you ' re required to keep ?
Person1: How much is that ?
Person2:You have to maintain a minimum balance of $ 100 .
Person1: Really ?
Person2:Yes , really .
Person1: What if I can ' t meet that requirement ?
Person2:You will be fined .
Person1: How much is the fine ?
Person2:It ' s going to cost you $ 25 .
Output:
informal