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
Example: customer: Hi. 
 agent: Hello. How can I help you? 
 customer: I would like to change my existing reservation as my plan to go for a holiday trip got postponed. Can you please help me with this? 
 agent: Sure, may I know your name please? 
 customer: My name is Anthony Phillips. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Unfortunately there is no reservation found with your given name. 
 customer: Not a problem, thank you for checking. 
 agent: Thank you for choosing us.
Example solution: no_reservation
Example explanation: Here the customer has not asked for any booking, he just wanted to update his already booked flight, so the status would be no_reservation

Problem: customer: Hi. Larry Garcia here. 
 agent: Hello, how can I aid you? 
 customer: Can you book a connecting flight to Washington for my family vacation? 
 agent: Sure, may I know your airport codes please? 
 customer: My airport codes for boarding the flight are DEN to DCA. 
 agent: Would you please provide me your trip dates? 
 customer: The price limit is less than 200. My preferable dates for travel are 03/20 to 03/22. 
 agent: Ok, please wait for a while. 
 customer: Sure. 
 agent: Sorry, there is no flight available as per your request. 
 customer: Ok, not a problem. I will try with other airlines. Thank you. 
 agent: My pleasure.

Solution: no_flight