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 guide you today? 
 customer: Can you find a flight for me from OAK to DFW? 
 agent: Sure, I am here to help you with that. Can you please share your planned travel dates? 
 customer: Ok, my journey dates are from June 05 to 07. 
 agent: May I know your name please? 
 customer: Sure, I am Stephen White. 
 agent: Do you have any class preference? 
 customer: No, I need a connecting flight. 
 agent: Would you like to travel in a connecting flight or in direct flight? 
 customer: I need a connecting flight as I said before. 
 agent: Do you have any other specifications? 
 customer: No. 
 agent: Flight-1017 is available in Delta Airlines with single connection limit and the ticket price is 100. Shall I proceed with booking? 
 customer: Yes, please. 
 agent: Stephen White, your booking is done in economy class, the depart time and return time is  afternoon. 
 customer: Thank you. 
 agent: Most welcome, thank you for reaching us. Have a safe journey.
Solution:
book