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:       Hey man , what do you have on tap ?  
 Person2:Heineken and Budweiser . We have a two-for-one happy hour special .  
 Person1:        Cool , give me a pint of Heineken and half a pint of Bud .  
 Person2:Okay ... A pint of Heineken and and half a pint of bud for table six ! And what about some appetizers ?  
 Person1:        Sure ! Let ’ s have some nachos and mozzarella sticks .  
 Person2:Okay . That ’ ll be 80 bucks .  
 Person1:        Wait ... What ! 

formal