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 can I aid you for today? 
 customer: Can you please help me in reserving my flight ticket from SFO to DEN? 
 agent: I am here to help you about that. Can you please provide your scheduled dates of journey? 
 customer: Sure, my travel dates are from Oct 20 to Oct 22. 
 agent: Would you like to have a connecting flight for your journey? 
 customer: I would prefer connecting flight. 
 agent: Do you have any other requirements for your journey? 
 customer: I would like to travel in economy class. 
 agent: Can you please provide your name for further proceeding? 
 customer: Myself Robert Green. 
 agent: Delta airlines is providing a flight to your region having a ticket fare of 100 with single connecting flight. Shall I proceed with the booking in this flight? 
 customer: Ok, please proceed. 
 agent: I have booked your flight ticket with the flight 1022 in an economy class. 
 customer: Thank you for booking. 
 agent: You are welcome, thank you for employing our service.
Output:
book