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: Hello, I am Jason Wilson. 
 agent: Hello. How can I aid you? 
 customer: I am planning to visit the Reedy Creek Park in Charlotte, could you please help me in booking a flight ticket from Washington? 
 agent: Sure, I will help you. May I know your airport codes? 
 customer: My airport codes are DC - DCA, NC - CLT. 
 agent: Can you share me your travelling dates? 
 customer: I want to fly on 05/09 and return on 05/11. 
 agent: Do you have any preferences? 
 customer: Yes, I need a halt in between my journey. 
 agent: There is a flight 1025 in Spirit airline and price 200 with a connection. Shall I go through booking? 
 customer: You can proceed to booking. 
 agent: Sure, Your reservation has been done. 
 customer: Thank you for your service. 
 agent: Thank you.
Solution:
book