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:       May I order , please ?  
 Person2:Of course .  
 Person1:        I would like sirloin steak and tomato salad .  
 Person2:Do you take dressing on your salad ?  
 Person1:        Yes , blue Cheese please . 

formal