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. Dennis Hall here. 
 agent: Hello. How can I help you? 
 customer: Reserve a flight ticket that is from SEA to CLT. 
 agent: Can you please tell your travelling dates? 
 customer: My travel dates are from 03/18 to 03/20. 
 agent: Sorry, there are no flights available with your requested details. 
 customer: Ok, not a problem. Thank you. 
 agent: Thank you and have a nice day.

Ex Output:
no_flight


Ex Input:
customer: Hello. 
 agent: Hello, How exactly I can serve you the best today? 
 customer: I am Katherine Anderson. Can you help me booking a flight ticket from LAX to PHL? 
 agent: Can you please share your travel dates that you have planned? 
 customer: I will start on Nov, 19 and return on Nov, 21. 
 agent: Ok, Do you like to go with a connecting or direct flight? 
 customer: I need a break in my journey. 
 agent: Ok, please wait a moment. let me search a flight for you. 
 customer: Sure. 
 agent: We have found a direct flight with AA airlines, flight number 1008 and the fare of 100. Shall I reserve a ticket for this airline? 
 customer: Please proceed with the booking. 
 agent: Sure, your ticket has been reserved. 
 customer: Thank you. 
 agent: Thanks for approaching us, wish you a great journey.

Ex Output:
book


Ex Input:
customer: Hi. 
 agent: Hello, how may I help you today? 
 customer: Can you please help me with booking a flight ticket from DCA to DTW? 
 agent: Sure, let me know your travelling dates. 
 customer: My travel dates are Nov 20 and 22. 
 agent: Do you want connecting flight? 
 customer: I need a connecting flight. 
 agent: Do you have any other requirements? 
 customer: I would like to depart at morning. 
 agent: May I know your name please? 
 customer: My name is Sharon Campbell. 
 agent: Ok, please wait for a moment. 
 customer: Ok. 
 agent: Sorry, there are no flights found with your given details. 
 customer: Ok, no issues. Thank you. 
 agent: Thank you for opting us.

Ex Output:
no_flight