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: Hello, I am Rachel Davis. 
 agent: Hello, how can I help you? 
 customer: I am planning to go for Brooklyn walking tour with my friends on 11/14. Can you please book a flight ticket for me? 
 agent: Sure, may I know when you want to travel? 
 customer: I intend to return from my journey on 11/16. 
 agent: Sure, can I know your airport codes please? 
 customer: I would like to board from Boston, BOS. 
 agent: Do you need any halt in between your journey? 
 customer: Yes, there should be a lay by. 
 agent: Can I know your destination airport code please? 
 customer: New York, EWR is my landing point. 
 agent: Wait a minute please. 
 customer: Sure. 
 agent: Thank you for waiting, we found a flight with number 1014 and airline AA at a price of 100 with 1 connection. Shall I proceed? 
 customer: Yes, you can proceed. 
 agent: Sure, your booking is done. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us, have  a nice day.
book