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:       Hello , room service . Can I help you ?  
 Person2:I ordered dinner about forty minutes ago . It hasn ’ t been delivery yet .  
 Person1:        We are sorry for the delay , ma ’ am . Could you hold the line , please ? I ’ ll check your order .  
 Person2:Okay .  
 Person1:        Your order is ready . It ’ s on the way to your room . We ’ re very sorry to have you waiting , Ma ’ am .  
 Person2:That ’ s okay . 

formal