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 Elizabeth Turner. 
 agent: Hello, how can I assist you today? 
 customer: Can you book a flight ticket? 
 agent: Sure, May I know your journey details? 
 customer: There is one of a kind art museum in Seattle, And I am art lover. So please book a ticket from TX - IAH to WA - SEA. Dates are 07/05 to 07/07. 
 agent: Thank you for the details provided. Please wait a moment, I will check the availability and get you back. 
 customer: Ok. My price is 1000 and one connection please. 
 agent: Thank you for waiting, We found Spirit with flight number 1025 and price is 200 matches your requirement. Shall I proceed for booking? 
 customer: Please book this flight. 
 agent: Your booking has been confirmed. Thank you for opting us, Have a great journey. 
 customer: Thank you.
book