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 am planning to visit CLT to attend business meeting, can you please help me in booking a flight ticket from HOU? 
 agent: Your trip dates please. 
 customer: My trip dates are May 6 and May 8. 
 agent: Do you have any connection limit? 
 customer: Yes, I need a connecting flight. 
 agent: Do you have any other preferences? 
 customer: Yes, I prefer to depart during evening and please look for an economy class. 
 agent: Your name please. 
 customer: Edward Martin here. 
 agent: Sorry to say that, there are no flights found with your details. 
 customer: Not an issue, anyway thank you for checking. 
 agent: Thank you for reaching us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I assist you today? 
 customer: Can you help me to book a flight ticket from MCO to LGA? 
 agent: Sure, may I know your planned travel dates? 
 customer: My travel dates are Feb 22 and Feb 24. 
 agent: Do you want connecting flight? 
 customer: I prefer direct flight for this trip. 
 agent: Do you have any other requirements? 
 customer: No, thanks for asking. 
 agent: May I know your name please? 
 customer: I am Christopher Martinez. 
 agent: Sorry, there are no flights found with your given details. 
 customer: No problem, thank you for the information. 
 agent: Thank you for opting us.

Output: no_flight


Input: Consider Input: customer: Hello, I am Susan White. 
 agent: Hello. How can I help you? 
 customer: Can you please help me to book a ticket from ATL to SFO? 
 agent: Your travelling dates please? 
 customer: My travelling dates will be on Aug 9 to Aug 11. 
 agent: Do you have any specifications? 
 customer: I need a connecting flight. My depart time should be evening. 
 agent: Here is a connecting flight with flight number 1017 and fare is 200, providing ticket in economy class and your departure time is 2:00 AM. Shall I proceed with booking? 
 customer: You can proceed. 
 agent: Your booking  is done Delta airlines. 
 customer: Thank you for your help. 
 agent: Thank you for choosing us.
Output: book