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: Well , humans could never make something like that .
Person2:Those poor Egyptians slaves worked so hard and you want to give aliens all the credit !
Person1: Be a little more open-minded , Stu ! Don't believe everything you read in your history books !
Person2:OK , but don't believe everything you see on The X-files , either !
Person1: Speaking of The X-files , it's on right now !
Output:
informal