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

Q: customer: Hello, I am Michelle Thompson. 
 agent: Hello, how may I help you at this moment? 
 customer: I would like to visit Disney Land in San Francisco, so could you please book a ticket for me? 
 agent: Can I have your journey dates? 
 customer: Sure, I would like to go on 12/11 and return back on 12/13. 
 agent: May I know your nearby airport codes? 
 customer: My source and destination airport codes are LGA and SFO. 
 agent: Please wait for a moment. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: There is a connecting flight available with Spirit airline, shall I book it? 
 customer: Ok, please proceed for further. 
 agent: Your booking is done with flight number 1009. Happy journey. 
 customer: Thank you for booking. 
 agent: Welcome. Thank you for opting us. 
 customer: Welcome.

A: book
****
Q: customer: Hi. 
 agent: Hello, how can I help you today? 
 customer:  I have to do some modification in my previous flight ticket booking that there is a sudden event held at my home town, so I am unable to travel the trip. can you please help me out with changing of my reservation? 
 agent: Sure, I am here to help you with that, can I know your good name to proceed further? 
 customer: Ronald Nelson here. 
 agent: Thank you. Please be online for a while. I will check your reservation status and get back to you. 
 customer: Ok. 
 agent: I am sorry to say you that there is no reservation found under your name in our database. 
 customer: That's ok, thank you for your help. 
 agent: Thank you for reaching us.

A: no_reservation
****
Q: customer: Hello, I am Anthony White. 
 agent: Hello, what can I do for you? 
 customer: I would like to book a flight ticket to  Atlanta, GA-ATL to meet my grand parents on 05/10. Can you help me with this? 
 agent: Sure, may I know your source airport code? 
 customer: My boarding point is Las Vegas, NV-LAS. 
 agent: When did you plan to return? 
 customer: I intend to return on 05/12. The connection limit should be one. 
 agent: Sure. Please wait a moment. 
 customer: Ok. 
 agent: There is a Frontier airline with flight number 1029 and price is 100 available with your requirements. 
 customer: Ok, you can book the ticket. 
 agent: Your reservation is done. 
 customer: Thanks for your assistance. 
 agent: Thank you for opting us.

A:
book
****