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 aid you? 
 customer: Can you please help me in booking a flight ticket from Orlando, MCO to Houston, HOU? 
 agent: May I know on which dates you are willing to travel? 
 customer: My journey dates are from Oct 31 to Nov 02. 
 agent: Do you have any other requirements? 
 customer: I prefer only economy class flight. 
 agent: May I know your name? 
 customer: My name is Nancy Davis. 
 agent: Sorry to inform you that unfortunately there is no flights available by the given details. 
 customer: Ok, that's not a problem. Thanks for your information. 
 agent: Thank you.

Ex Output:
no_flight


Ex 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.

Ex Output:
no_flight


Ex Input:
customer: Hello, I am Dorothy Evans. 
 agent: Hello,. How may I help you? 
 customer: I want to change my reservation, can you help me with it? 
 agent: Please wait for a while. 
 customer: OK. 
 agent: No reservation exists. Thanks.

Ex Output:
no_reservation