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:       Hello , is this housekeeper ?  
 Person2:Yes ma'am , may I help you ?  
 Person1:        This is room eleven-seven and we have just checked in .  
 Person2:Yes ?  
 Person1:        Our room hasn't been cleaned up yet.So would you send one of your housekeepers to clean up our room ?  
 Person2:Oh , yes , ma'am . We'll come right away then.Your room number and your name , please .  
 Person1:        Our room number is eleven-seven and my name is Terry Chen .  
 Person2:Thank you.Would you hang up and wait ? 

formal