Definition: In this task, you are given a conversation between a flight agent and the customer. You are given 4 options and you need to select the goal of the conversation. It is provided as part of customer's context, which has to be one of the following: `book`: Make a new reservation, `cancel`: Cancel an existing reservation, `no_flight`: No flight found for the customer's preference, `no_reservation`: No reservation / No change / No cancellation was made in the conversation, mostly enquiring details
Input: customer: Hello. 
 agent: Hello. How may I guide you now? 
 customer: I would like to attend a meeting at Houston, please help me in booking a ticket from HOU to IAH. 
 agent: May I know your desired dates for this journey? 
 customer: My desired travel dates are on Nov 1 and Nov 3. 
 agent: May I know your maximum connection limit? 
 customer: I need a flight with single connection. 
 agent: Do you have any other requirements? 
 customer: No more requirements. Thank you for asking. 
 agent: Meanwhile, may I know your name please? 
 customer: My name is Jerry Perez. 
 agent: There is a flight-1018 by Frontier Airlines with 1 connection at the price of 100 in economy class with depart at 16:00 hours and return at 11:00 hours. Can I book it for you now? 
 customer: Ok, please book my ticket. 
 agent: Your ticket is successfully reserved, thank you for choosing us. 
 customer: Thank you for your assistance. 
 agent: Have a safe flight journey.
Output:
book