Teacher: 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
Teacher: Now, understand the problem? If you are still confused, see the following example:
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
Reason: 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

Now, solve this instance: customer: Hello. 
 agent: Hello. How may I assist you now? 
 customer: Can you please help me to book a flight ticket from ORD to OAK? 
 agent: Sure, I am glad to help you with that. Can you please provide your itinerary dates of travelling? 
 customer: My travelling dates are Dec 19 to Dec 21. 
 agent: Can I know your name to book the flight ticket? 
 customer: Larry Thompson. 
 agent: Do you have any connection limit? 
 customer: I need a single connection of flight. 
 agent: Any other preferences do you have? 
 customer: No. 
 agent: Please be on hold to check the flights. 
 customer: Ok. 
 agent: I have found a business class flight for your journey having with the ticket fare of 900 provided by Delta airlines. Are you ok with this flight? 
 customer: Ok, please proceed to book. 
 agent: Ok, your ticket has been confirmed in flight number 1028. 
 customer: Thank you. 
 agent: Thank you for reaching to our services, hope you have a safe journey.
Student:
book