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

Ex Input:
customer: Hello,.
agent: Hello, how can I help you?
customer: Can you please help me in booking my flight ticket from DCA to EWR?
agent: Sure, may I know your travelling dates?
customer: My planned travel dates are April 01-03.
agent: Do you have any connection limit?
customer: I prefer to fly in connected flight.
agent: Any other preferences?
customer: I am looking for not to fly in low cost airlines.
agent: May I know your name?
customer: Stephanie Hernandez is my name.
agent: Sorry, there are no flights found with your details.
customer: Ok, no issues. Thank you for your service.
agent: Thank you.

Ex Output:
no_flight

Ex Input:
customer: Hello.
agent: Hello.
customer: Sarah Scott here.
agent: How may I assist you at this moment?
customer: I want to meet my cousin to discuss about his marriage, so please book my ticket from SEA to ATL.
agent: Sure, I am glad to help you with that. Can you please provide your planned dates of travelling?
customer: My trip dates are 11/30 and 12/02.
agent: Please wait a moment to check the flights availability in your route.
customer: Sure.
agent: We regret to inform you that there are no flights moving to your planned region with your planned dates of travelling.
customer: No problem, I will find an alternative way to travel.
agent: Thank you for reaching to our services, have a great day.
customer: Thank you for the help.

Ex Output:
no_flight

Ex Input:
customer: Hi.
agent: Hello.
customer: I am Carolyn Martinez.
agent: Carolyn, how may I aid you?
customer: Can you please help me in booking my flight ticket from 08/19 and 08/21.
agent: Please provide your airport codes.
customer: My travelling airport codes are LGA to PHX.
agent: Please hold on for a moment.
customer: Ok.
agent: We found a flight with 1 connection from Delta airlines and ticket costs you 200.
customer: Ok, please proceed.
agent: Your ticket is reserved in flight 1009.
customer: Thank you .
agent: Thank you for approaching us.

Ex Output:
book