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

Example input: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Example output: no_reservation
Example explanation: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation
Q: customer: Hello. 
 agent: Hello, how can I guide you for today? 
 customer: I have planned to attend my office meeting in  DEN from EWR, can you assist me in booking my ticket? 
 agent: I am happy to help you in booking your flight ticket. Can you please let me know your planned dates of journey? 
 customer: My trip dates are Oct 27th and Oct 29th. 
 agent: Would you like to have a connecting flight or a direct flight for your journey? 
 customer: Yes, I need one connection between my trip. 
 agent: Can you please let me know your name for reservation purpose? 
 customer: Melissa Carter. 
 agent: Do you have any other specification for your journey to met with? 
 customer: No. 
 agent: JetBlue airlines is providing a flight to your region having a ticket fare of 200 with single connecting flight which departures in the evening. Shall I proceed with the booking in this flight? 
 customer: Proceed. 
 agent: I have booked your flight ticket with the flight 1015 in an economy class. 
 customer: Thank you for booking. 
 agent: You are welcome, thank you for employing our service. Have a safe journey.
A:
book