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 may I help you today? 
 customer: I need to attend my parent's wedding anniversary on 05/26 in Washington DC - DCA, could you please help me to book my flight ticket. 
 agent: Sure, could you please provide your further details to proceed? 
 customer: OK. Actually I want to travel from Washington DC - DCA on 05/26 to Denver, CO - DEN. And my return date is on 05/28. Please make the booking with the name Anna Harris. 
 agent: OK, do you have any preference connections and price limit? 
 customer: Yes, price limit can be 1000 and connection must be one. 
 agent: OK, we are glad to inform you that we have found a flight on that day. details are as follows airline-Southwest flight number-1022 connection-1 and price is 100. Shall I proceed to booking? 
 customer: I am comfortable with this booking, you can proceed now. 
 agent: OK, your reservation has been done. 
 customer: Thank you. I am happy with your service. 
 agent: Your are welcome, thanks for contacting us. Have a great day ahead.
Solution:
book