Teacher: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
Teacher: Now, understand the problem? Solve this instance: customer: HI. 
 agent: Hello, how may I aid you? 
 customer: David Young here. Can you please help me in booking a ticket from AUS to EWR? 
 agent: Sure, I am here to help you out. Please provide me your trip dates. 
 customer: Sure, my journey dates are 03/05 and 03/07. 
 agent: Please wait a moment. Here is a flight with 1 stop and price is 200 in JetBlue airlines. Can I proceed with it? 
 customer: Ok, you can proceed for booking with that flight. 
 agent: Your ticket has been booked with 1004 flight. 
 customer: Thank you for booking.
Student:
book