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.
agent: Hello. How may I assist you today?
customer: I am Sarah Mitchell.
agent: Welcome to flight booking agency Sarah.
customer: Due to sudden change in my planned dates of journey, I would like to change my reservation. Can you please help me out with changing of my reservation?
agent: Sure, I will help you with that.
customer: Sure.
agent: I have found your reservation. Can you please provide your preferable airport codes?
customer: Sure, my travel airport codes are from SFO to IAH.
agent: Ok, may I know your planned dates of travelling?
customer: My travel dates are 03/25 and return back on 03/27.
agent: Please wait a moment to check the flights.
customer: Ok, take your time.
agent: We regret to tell you there are no flights moving to your region with you planned dates of travelling.
customer: No issues with that one. Thank you for your immediate response.
agent: Thank you for reaching us, have a great day.
customer: Welcome.

A: no_flight
****
Q: customer: Hello.
agent: Hello, how may I assist you today?
customer: Can you reserve me a ticket from OAK to MSP?
agent: Sure, may I know your planned travel dates?
customer: My trip dates are Feb 17 to 19.
agent: Do you have any limits on number of connections?
customer: I need a connecting flight.
agent: Do you have any another specifications on your journey?
customer: No.
agent: may I know your name for the booking process?
customer: Brian Perez here.
agent: Sorry, no flights are available on your requirement dates.
customer: Ok, no issues. Thank you for the information.
agent: Welcome, thank you for reaching us.

A: no_flight
****
Q: customer: Hello.
agent: Hello, How can I serve you?
customer: I am Anthony Campbell, I want to book a flight ticket to Washington DC - IAD to attend a wedding event. Please book a ticket from Charlotte, NC - CLT.
agent: Sure.
customer: I wish to travel on 06/25 and 06/27.
agent: Is there any other requirements?
customer: Yes, price can be 200 with a connection.
agent: We have found a flight from Frontier airline with flight number 1012.
customer: Please go for booking process.
agent: Your ticket has been reserved.
customer: Thanks for your service.
agent: Thank you for choosing us.

A:
book
****