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 , this is United Airlines . 
 Person2:Hello , I want confirm my flight . My name is Jesse . 
 Person1:        When is your flight ? 
 Person2:June loth . 
 Person1:        One first class seat on flight YW132 , is that right ? 
 Person2:Yes , thanks . By the way , what time do I have to start check-in ? 
 Person1:        You are supposed to check in at least one hour beforehand . 

formal