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. How can I help you? 
 customer: I want to book a flight ticket from LAX to SEA. Can you please help me in that? 
 agent: Sure, I will help you in booking. Can you please share your trip dates? 
 customer: My trip dates are Dec 19 to Dec 21. 
 agent: Do you have any connection limit preference? 
 customer: I need a connecting flight. 
 agent: Sorry, there are no flights found for the given dates. 
 customer: Ok, no problem. Thank you. 
 agent: May I know your name for documentation purpose? 
 customer: Myself Jennifer Harris. 
 agent: Thank you for choosing us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you? 
 customer: My holiday vacation has been postponed.Can you please help me for changing the existing reservation? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: May I know your good name please? 
 customer: Sure, my name is Matthew Nelson. 
 agent: Sorry, there is no reservation found on your name in our database to change. 
 customer: Ok, no problem. 
 agent: Thank you for approaching us. 
 customer: Thank you for your help. 
 agent: Have a great day.

Output: no_reservation


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I aid you? 
 customer: I would like to travel from BOS to CLT as a business trip. 
 agent: Sure, can you share your journey dates? 
 customer: My trip dates are 09/26 and 09/28. 
 agent: Do you have any preferences? 
 customer: I need break in my journey. 
 agent: May I know your name? 
 customer: Emma Harris here. 
 agent: Sorry, there is no flight on your given dates. 
 customer: No problem, Thanks for the information. 
 agent: Thank you for opting us.
Output: no_flight