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:       I'd like to reserve two seats for tomorrow night .  
 Person2:Would you like orchestra seats ?  
 Person1:        Isn't there anything less expensive ?  
 Person2:Not unless you want the matinee . 

formal