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:       What is your policy on returns ?  
 Person2:If you bring them back with your receipt within seven days , you'll get a full refund . Also , if you need alterations to the pants , just bring them in and we'll do them for free .  
 Person1:        Sounds good .  
 Person2:That'll be $ 70 , please . Will you be paying by cash or charge ?  
 Person1:        Charge . Here's my card .  
 Person2:Okay , sir , here you are . Thank you very much .  
 Person1:        Thank you . 

informal