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:       Where can I park my car ?  
 Person2:You need to get a car tag first . There's a one hundred Yuan deposit for the car tag .  
 Person1:        Okay . Here you are .  
 Person2:Thank you . We'll bring the receipt up to your room when we get it . 

formal