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. 
 agent: Hello. How can I assist you? 
 customer: I want to book a connecting flight ticket to attend an event from NY. Can you help me? 
 agent: May I know you travelling airport codes? 
 customer: EWR and OAK are my airport codes. 
 agent: Can you please let me know your travelling dates? 
 customer: 12/28 and 12/30 are my travelling dates. 
 agent: May I know your  class preference? 
 customer: I need a business class. 
 agent: Please let me know your name? 
 customer: Myself Ronald Scott. 
 agent: Here is a connecting flight with fare 1000 and 1026 as flight number in United airline. Shall I proceed with booking? 
 customer: You can reserve it for me. 
 agent: Your ticket is confirmed in business class. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us.
Solution:
book