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

Input: Consider Input: customer: Hello,.
agent: Hello, how can I aid you?
customer: I am Charles Miller. I am planning to go for Yosemite Adventure with my friends at Detroit, can you please book a ticket under the price 5000?
agent: Sure, can you share your trip dates?
customer: I want to travel on 04/26, and need to catch return flight on 04/28.
agent: Do you need any halt in between your journey?
customer: I need a halt.
agent: May I know your journey airport codes?
customer: I need to leave from my nearest airport HOU to reach DTW.
agent: Give me a minute.
customer: Sure.
agent: There is a connecting flight with number 1013 in airline Southwest, the fare is 100. Can I book it?
customer: Proceed with the booking.
agent: Your ticket is reserved.
customer: Thanks for the help.
agent: Thank you for opting us.

Output: book

Input: Consider Input: customer: Hello.
agent: Hello. How can I help you today?
customer: I am looking for a flight which will be travelling from Denver to EWR. Can you please help me in this?
agent: Sure, I am gleeful to help you with that. May I know your travelling dates, please?
customer: My travel dates are from Oct 24 to Oct 26.
agent: Can I know your connection limit?
customer: I am fine comfortable with minimum 1 connection limit.
agent: Do you have any class preference?
customer: No that's it, thank you.
agent: Is there any other requirements regarding on your journey?
customer: No.
agent: There is a connecting flight-1000 available in Jet Blue Airlines with a fare of 100. Shall I book it?
customer: Please proceed my booking with my name of David Thompson.
agent: David Thompson, your booking is done in economy class.
customer: Thank you so much.

Output: book

Input: Consider Input: customer: Hi.
agent: Hello. How may I help you?
customer: Can you pleas check for the flights from Dec 21 to Dec 23.
agent: Sure, what are your trip source and destination?
customer: My airport codes are from ORD to DFW.
agent: Do you need any connections?
customer: Please check for 1 connecting flight.
agent: Are there any other preferences?
customer: I will be returning in afternoon with economy class.
agent: May I know your name?
customer: My name is Sandra King.
agent: Sorry, there is no flight found with your details.
customer: Oh! That's fine. Thank you for checking.
agent: Thank you for reaching us.
customer: Most welcome.
Output: no_flight