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

customer: Hello,. I am Joshua Thompson. 
 agent: Hello, how may I aid you? 
 customer: I need to book a flight ticket to Washington with my friends, to enjoy fun-filled vacations. Could you please book a plane ticket? 
 agent: Sure, please provide your travel dates? 
 customer: I want to depart on 02/08 and return on 02/10. 
 agent: Do you have any connection limit? 
 customer: I need a connecting flight. 
 agent: Please share your airport abbreviates? 
 customer: My origin is CO-DEN and destination is DC-IAD. 
 agent: Ok, please wait a minute I will check the availability of flights and let you know. 
 customer: Ok. 
 agent: Thank you for your time, there is 1013 flight available in Delta airline has fare 1200. May I proceed with this booking? 
 customer: You may proceed with booking. 
 agent: Ok, your booking has been confirmed. 
 customer: Thank you for your quality service. 
 agent: Thank you for availing with us. Have a safe flight.
book