You will be given a definition of a task first, then some input of the task.
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, how can I aid you today? 
 customer: Could you please book a ticket on the name of Kathleen Hernandez as I have to attend a music festival? 
 agent: Sure, please help me with your travelling dates? 
 customer: My travelling dates are 10/05 and 10/07. 
 agent: Could you please help me with your airport codes? 
 customer: My source is Charlotte, NC-CL and destination is Houston, TX-HOU. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Thanks for waiting, flight- 1007, airline- Hawaiian, price- 200 matches your requested details. Shall I proceed? 
 customer: You can proceed. 
 agent: Ok, your ticket has been processed. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us.
Output:
book