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:       Good evening , sir , and welcome to Chez Attitude .  
 Person2:We have a dinner reservation for four at 7:00 under the name of Foster .  
 Person1:        Yes , Mr . Foster , if you would please be seated over in the waiting area , our hostess will be with you in a moment .  
 Person2:Thank you . Would it be OK if we have a cocktail while we are waiting ?  
 Person1:        Of course , I will tell her .  
 Person2:I would really prefer an outside table . Would that be possible ?  
 Person1:        Sure , if you would like one of those tables , I could seat you right away .  
 Person2:Sure , that would be great ! Thank you !  
 Person1:        Here are your menus and the wine menu , and would you like to order your drinks now ?  
 Person2:Yes , I would like a vodka gimlet , please .  
 Person1:        Sure , no problem , sir .  
 Person2:Thank you very much . 

informal