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:       We'll take the route No . 10 .  
 Person2:Fine . How many people are there in your party ?  
 Person1:        Just two . How much does the trip cost ?  
 Person2:$ 200 for double .  
 Person1:        Is there any chance of a lower price ?  
 Person2:I am afraid not . Right now it's the tour season . 

formal