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 , how are you today . Here for your six month check-up ? 
 Person2:I'm fine , Dr . Beecham . Yes , just a cleaning and check-up today . 
 Person1:        Oh , fine . Let's take a look . 
 Person2:( She probed my teeth and checked my gums . ) Well , it looks like you have a cavity and your crown is loose . We need to fill that cavity before it gets any worse and the crown needs to be refitted . Make an appointment for next week and I'll take care of them . 
 Person1:        Okay , I'll do that , but my crown was just put on last year . Will my dental insurance cover the work ? 
 Person2:Since you had that done here , we'll take care of it . There won't be a charge . And , your insurance should cover the work on the cavity . Now , I'm going to have the hygienist do your cleaning and I'll see you soon for the other work . 
 Person1:        Thanks , doctor . 

formal