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:       Pete's Pizza , may I help you ? 
 Person2:Yes , I have one of your buy one , get one free coupons , and I'd like to order two large pizzas . 
 Person1:        Will that be for pick-up or delivery ? 
 Person2:Delivery , please . 
 Person1:        Can I get your phone number ? 
 Person2:Sure . It's 2331-7600 . 
 Person1:        And your address ? 
 Person2:2244 Forest Drive . 

formal