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: Where is the bus ?
Person2:I think it's running late .
Person1: It should've been here 30 minutes ago .
Person2:It should be coming soon .
Person1: It better , because I'm already late for work .
Person2:I can't stand riding the bus .
Person1: Me too , it's so unreliable .
Person2:That is true .
Person1: It's also horrible having to be at a bus stop in any kind of weather .
Person2:Exactly.That ' s the worst part .
Person1: I think it's time we started driving .
Person2:Yes , I agree .
Output:
informal