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

Ex Input:
customer: Hi. I am Laura Turner. 
 agent: Hello, How can I serve you? 
 customer: I want to fly with the direct flight from Washington to attend an interview in Philadelphia, can you help me to book an economy class ticket? 
 agent: Sure, May I know the travel dates? 
 customer: I intend to start on Nov 28th and I will return within two days that is on Nov 30th. 
 agent: Please help me with your journey codes. 
 customer: My source and destination airport code are IAD and PHL. 
 agent: Please wait a minute. 
 customer: Sure. 
 agent: Sorry, No flights found with your chosen dates. 
 customer: No issues, I'll choose any alternative to reach my destination. Thank you. 
 agent: Thank you for opting us.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello. How may I assist you? 
 customer: I want to cancel my recent reservation, can you please help me with this? 
 agent: May I know your good name please? 
 customer: I am John Jackson. 
 agent: Please give me a moment. 
 customer: Sure. 
 agent: There is a reservation found with your given name. Shall I proceed with the cancellation? 
 customer: Ok, please cancel my booking. 
 agent: Your ticket has been cancelled. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us.

Ex Output:
cancel


Ex Input:
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.

Ex Output:
book