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. 
 agent: Hello. 
 customer: Myself Karen Anderson. 
 agent: How may I help you? 
 customer: I am planning to visit San Francisco, will you help me in booking the flight ticket from DEN to SFO? 
 agent: Sure, I am glad to help you. Can you please share your travel dates? 
 customer: My travelling dates are Jan 30 and Feb 01. 
 agent: May I know your connection limit? 
 customer: I need a flight with single connection. 
 agent: May I know your depart and return time? 
 customer: My return time must be in afternoon. 
 agent: Please wait for a while. Here, there is a flight with 1 connection in Hawaiian airlines and price is 200. Shall I book? 
 customer: Sure, you can proceed with the booking. 
 agent: Ok, your ticket has been booked with the flight 1022. 
 customer: Thank you for helping me. 
 agent: Thank you for choosing us.
book