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: Consider Input: customer: Hello. 
 agent: Hello, what can I do for you today? 
 customer: Can you please help me in flight ticket booking process from OAK to SFO? 
 agent: Sure, please forward your trip dates. 
 customer: Thank you for your response, I want to take off on Aug 27 and book my return ticket also on Aug 29. 
 agent: Is there any class preference? 
 customer: No. 
 agent: Any other requirement to be met? 
 customer: I will prefer direct flight. 
 agent: Can you please share your name to proceed further? 
 customer: Sure, my name is Steven Davis. 
 agent: Sorry, no flights found as per your requirements. 
 customer: Oh! It's ok, no problem. Thank you for your information. 
 agent: Thank you for contacting us.

Output: no_flight


Input: Consider Input: customer: Hello. I am Michael Lopez. 
 agent: Hello, how can I help you today? 
 customer: I need to book a ticket to meet my parents on 05/15. Could you please help me in booking a return ticket on 05/17? 
 agent: Sure, please share me your source and destination. 
 customer: My source and destination code is DTW and LAS. 
 agent: May I know your connection limit? 
 customer: I need a stopover in between the journey. 
 agent: Please wait for a moment. I will check the availability of the flights. 
 customer: Sure. 
 agent: We are glad to say that, we found an airline: UA, flight number: 1002 with a single connection and price is 100. 
 customer: You can proceed with booking. 
 agent: Your flight ticket has been reserved. 
 customer: Thank you for your quick response. 
 agent: Thank you for opting us.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello. How may I assist you now? 
 customer: Can you please help me to book a flight ticket from ORD to OAK? 
 agent: Sure, I am glad to help you with that. Can you please provide your itinerary dates of travelling? 
 customer: My travelling dates are Dec 19 to Dec 21. 
 agent: Can I know your name to book the flight ticket? 
 customer: Larry Thompson. 
 agent: Do you have any connection limit? 
 customer: I need a single connection of flight. 
 agent: Any other preferences do you have? 
 customer: No. 
 agent: Please be on hold to check the flights. 
 customer: Ok. 
 agent: I have found a business class flight for your journey having with the ticket fare of 900 provided by Delta airlines. Are you ok with this flight? 
 customer: Ok, please proceed to book. 
 agent: Ok, your ticket has been confirmed in flight number 1028. 
 customer: Thank you. 
 agent: Thank you for reaching to our services, hope you have a safe journey.
Output: book