Definition: 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
Input: customer: Hi. 
 agent: Hello,. 
 customer: I am Ashley Hall. 
 agent: How can I help you? 
 customer: I need to book a flight ticket to attend a meeting at LAS, Can you please help me for booking? 
 agent: Sure. Please provide your journey dates? 
 customer: I would like to travel on 11/10 to 10/12. 
 agent: Please specify origin airport code? 
 customer: My take off is AUS. 
 agent: Could you please provide journey dates? 
 customer: I would like to travel no 11/10 to 11/12. 
 agent: Ticket is available with flight number 1002, connections 1, airline Delta having price 100. 
 customer: Ok, proceed for booking. 
 agent: Your ticket is booked. 
 customer: Thanks for your information. 
 agent: Thank you.
Output:
book