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:       Room service . Can I help you ?  
 Person2:Yes , tomorrow is my friend's birthday.Could I arrange a birthday party for him through you ?  
 Person1:        Certainly .  
 Person2:I want to order a large birthday cake , several kinds of cold dishes , pastries and fruits .  
 Person1:        Any drinks ?  
 Person2:I've got whiskey and brandy but I need some beer and soda.That ' s all . 

formal