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 can I assist you today?
customer: I am Brian Hernandez, want to change my existing reservation, because my interview got postponed to other dates. Can you help me in this?
agent: Sure. Please wait for a while.
customer: Sure.
agent: Thanks for waiting, there is no reservation found on your name.
customer: Ok. Thanks for your quick response.
agent: Thank you for availing us.

A: no_reservation
****
Q: customer: Hello. I am Jerry Hall.
agent: Hello Jerry Hall, how may I aid you?
customer: I planned to meet my cousin in SFO, can you please help me to book a flight ticket from SEA?
agent: Sure, please provide your itinerary dates.
customer: I prefer to travel on Jul 5 and Jul 7.
agent: Do you have any specifications?
customer: I would like to depart in evening in 1 connecting flight.
agent: Do you have any other specifications?
customer: No.
agent: Please wait for a while.
customer: Sure.
agent: Sorry, no flights are available as per your specifications.
customer: Ok, no problem. Thank you for your time.
agent: Thank you for choosing us.

A: no_flight
****
Q: customer: Hello. I am Christine Brown.
agent: Hello. How can I help you?
customer: I want to attend my friend's wedding in New York.Can you help me to book a flight ticket from PHX to LGA?
agent: Sure, please tell your travelling dates?
customer: I want to depart on 01/12 and return by 01/14.
agent: Delta airlines is available with 1 connection and ticket price is just 200. Shall I proceed with it?
customer: Please book this ticket for me.
agent: Your reservation is confirmed with flight 1004.
customer: Thank you for helping me out.
agent: Thank you and have a nice day.

A:
book
****