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. 
 customer: I am Paul Collins. 
 agent: How can I help you out? 
 customer: Could you help me in booking a flight ticket from SFO to DFW? 
 agent: Sure, Can you please let me know your planned trip dates? 
 customer: I will start on July 26, return on July 28. 
 agent: Is there any connection limit for you? 
 customer: I want direct flight. 
 agent: Please help me with your specific depart and arrival timings. 
 customer: My return time should be morning. 
 agent: Do you have any class preference? 
 customer: No. 
 agent: Is there nay other specifications to be met? 
 customer: I want normal cost airline. 
 agent: Thanks for providing details, no flights are available on your journey routes. 
 customer: Not an issue, thank you. 
 agent: Thank you for choosing us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am David Parker. 
 agent: How can I assist you for the day? 
 customer: I am planning to visit New York, can you please book me the ticket from OAK to JFK? 
 agent:  Sure, I am here to help you with that flight ticket booking. May I know your  preferable travel dates, please? 
 customer: My preferable journey dates are from 11/10 to 11/12. 
 agent: Sorry to tell you that, there are no flights available as per your given travel dates. 
 customer: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information. 
 agent: You are welcome, thank you for approaching us.

Output: no_flight


Input: Consider Input: customer: Hi. I am Edward Moore. 
 agent: Hello, what help you are looking for? 
 customer: I want to go for a weekend trip with my friends to Oakland.Can you help me to reach from SFO to OAK? 
 agent: Please share your itinerary dates. 
 customer: I want to depart on 04/28 and return by 04/30. 
 agent: Please stay online for a moment. 
 customer: Sure. 
 agent: Sorry, all tickets are booked for this summer. 
 customer: That's ok. Anyways, thank you for your help. 
 agent: Thank you for connecting us.
Output: no_flight