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 Kathleen Anderson. 
 agent: Hello, how may I support you at present? 
 customer: I need to book a flight ticket to meet my brother to discuss about the new project for the new office at Detroit, MI - DTW. 
 agent: Sure, we are ecstatic to help you. 
 customer: Thank you. 
 agent: May I know your journey dates? 
 customer: My journey dates are 12/09 to 12/11. 
 agent: From which airport, you are willing to board? 
 customer: My boarding point is from New York, NY - EWR. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent: Thanks for your time, we found a connecting flight with 1017 number and the fare is 100. 
 customer: Please proceed to book. 
 agent: Ok, your ticket has been confirmed. 
 customer: Thank you. 
 agent: Thank you for choosing us.
book