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 ! How do I restock my minibar ?  
 Person2:You've drunk everything , sir ?  
 Person1:        I finished it all .  
 Person2:Do you want the whole minibar , or just certain items ?  
 Person1:        Send me up three bottles each of Perrier and Jim Beam .  
 Person2:That's three Jim Beams and three Perriers . Anything else , sir ?  
 Person1:        The apples in my room were delicious . Bring me a few more , please .  
 Person2:Okay . Are you sure there isn't anything else ?  
 Person1:        You know , some grape juice would be really nice , too .  
 Person2:Be patient for just a few minutes , sir , and someone will be at your door . 

formal