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'.

Example Input: Person1: Can you tell me the time ? I've got an appointment at 8: 30 .
Person2:It's 8 sharp by my watch .
Person1: Gee ! There's only thirty minutes to go .
Example Output: informal

Example Input: Person1: Congratulations ! Is it a boy or a girl ?
Person2:It's a boy .
Example Output: informal

Example Input: Person1: Ladies and gentlemen , welcome to tonight's fashion show .
Person2:We see you are all dressed to the nines .
Person1: How very appropriate , because tonight we have a most dazzling show for you !
Person2:Yes , this runway is going to sparkle with glamour and style !
Person1: Some of tonight's highlights are dressed in the latest straight from Shanghai .
Person2:And others directly from New York .
Person1: So , sit back and relax and get your order forms ready .
Person2:Because you're going to love this show !
Example Output:
informal