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: Do you have spare time tonight ?
Person2:What's the matter ?
Person1: There will be a live show of football tonight .
Person2:What teams are playing tonight ?
Person1: AC Milan versus Real Madrid .
Person2:That will be a tough match , right ?
Person1: Absolutely .
Person2:What are we waiting for ? It's already 7 pm now . Let's buy some drinks and desserts now .
Person1: Great idea ! Here we go !
Output:
informal