Detailed Instructions: 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
See one example below:
Problem: 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.
Solution: no_reservation
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. I am Laura Walker. 
 agent: Hello, how can I aid you today? 
 customer: As I keep travelling due to the nature of my work, this time I have to travel to MCO. Please help me to book a flight from PHL. 
 agent: Sure, when are you planning to start and return on? 
 customer: I am planning to start my journey on Nov 10th and return on Nov 12th. 
 agent: Do you need a connecting flight? 
 customer: Yes, I need a connecting flight. 
 agent: What are your departure and return timings? 
 customer: The return time should be afternoon. 
 agent: In which class do you want to fly? 
 customer: I am comfortable with any class. 
 agent: Thank you for your details, we found a connecting flight 1021 in economy class with American Airline. Shall I proceed with afternoon flight while returning? 
 customer: Please proceed. 
 agent: Your ticket has been confirmed. 
 customer: Thank you. 
 agent: Thank you.
Solution:
book