Given the task definition and input, reply with output. 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: What do you like to do in your spare time ?
Person2:I like taking photos .
Person1: Really ?
Person2:Yes , look at the photos I took .
Person1: They are beautiful . You did a good job .
Person2:Thank you for saying so .
Person1: As a matter of fact , you are really a terrific photographer .
informal