Given the task definition and input, reply with output. 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: Hi. Nicole Robinson here. 
 agent: Hello. How may I assess you? 
 customer: I am Nicole Robinson need to visit Philadelphia to discuss security issues with the government officials there. So can you book a flight ticket for me? 
 agent: Sure, I can help you with the flight ticket booking. Can you please provide me your origin and destination airport codes? 
 customer: Sure. My airport codes for boarding the flight are JFK to PHL. 
 agent: Ok, on which dates you are willing to travel? 
 customer: My preferable dates for travel are 04/20 to 04/22. The price limit is less than 500. 
 agent: Ok, just a minute. I will check the flight for you and let you know the flight details. 
 customer: Sure. 
 agent: The Hawaiian airlines is providing the service in this route which is having a connection limit 1 and the price is 100 only. Can I book your ticket with this flight? 
 customer: I am happy with the airlines. You can book it. 
 agent: Ok, I have booked your ticket with the above mentioned airlines and the flight number is 1029. 
 customer: Thank you. 
 agent: You are most welcome. Thank you for reaching us. Have a safe flight.
book