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: Hello,. 
 agent: Hello, How may I assist you today? 
 customer: My friends house warming function was postponed due to under construction. So I want to cancel my recent reservation. 
 agent: Sure, May I know your name please? 
 customer: Sure. I am Virginia Turner. 
 agent: Ok, please wait for a minute, I will check and let you know. 
 customer: sure. 
 agent: Thanks for your patience. Unfortunately, there is no reservation found with your name. 
 customer: Ok, no problem. 
 agent: Thank you for approaching us. 
 customer: Thank you for assisting me.

Ex Output:
no_reservation


Ex Input:
customer: Hi. 
 agent: Hello. How may I help you? 
 customer: Can you pleas check for the flights from Dec 21 to Dec 23. 
 agent: Sure, what are your trip source and destination? 
 customer: My airport codes are from ORD to DFW. 
 agent: Do you need any connections? 
 customer: Please check for 1 connecting flight. 
 agent: Are there any other preferences? 
 customer: I will be returning in afternoon with economy class. 
 agent: May I know your name? 
 customer: My name is Sandra King. 
 agent: Sorry, there is no flight found with your details. 
 customer: Oh! That's fine. Thank you for checking. 
 agent: Thank you for reaching us. 
 customer: Most welcome.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello. How can I assist you today? 
 customer: I am Patricia Smith, can you help me to book a flight with 1 connection? 
 agent: Sure, will you mention your travelling dates please? 
 customer: My travelling dates are 01/08 and 01/10. 
 agent: Please provide your airport codes that you want to travel. 
 customer: I would like to fly from ORD to DCA. 
 agent: Please give me a moment. 
 customer: Ok. 
 agent: Thanks for waiting, there is a flight with price 100 and the connections 1 is available. Shall I confirm your ticket? 
 customer: Proceed with booking. 
 agent: Your ticket is booked. The flight number is 1025 and the airline is Delta. 
 customer: Thank you. 
 agent: Welcome, have a great day.

Ex Output:
book