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: Dave , wake up .
Person2:Which ? Zina ? What time is it ?
Person1: It's seven-thirty . I want to know who left this note on my desk .
Person2:What note ? I can't see . I just pulled an all-nighter .
Person1: It's a little green post-it note , stuck right in the middle of my computer screen .
Person2:And ? What does it say ? Isn't there a name ?
Person1: It says , Zina , I like how you rhumba . An admirer .
Output:
formal