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: Want to join me for a midnight snack ? I need to grab something to eat .
Person2:Fine with me , but no more chafing dish .
Person1: Let's go the food stall . There's a good one just around the corner .
Person2:I'd love to try some snacks .
Person1: ( Later ) Everything looks tempting . What do you want to have ?
Person2:Kebabs and roast squid .
Person1: Can I have a bite ?
Person2:Help yourself .
Person1: Supper !
informal