Definition: 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'.
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 ! 

informal