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: My name is Margaret Smith. 
 agent: How can I aid you? 
 customer: Can you please book me a flight ticket to LGA from EWR? 
 agent: Sure, may I know your preferable journey dates please? 
 customer: Sure, my trip dates are from 11/20 to 11/22. 
 agent: Wait for a while please. 
 customer: Ok, take your time. 
 agent: Hawaiian airlines is available in your route with the ticket fare of 100, shall I proceed with the booking? 
 customer: Ok, please confirm my reservation. 
 agent: Your ticket is booked with the flight-1004. 
 customer: Thank you. 
 agent: Thank you for reaching us.
book