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

Example Input: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: I am planning to for a heritage tour in PHX. Can you book me a ticket from AUS? 
 agent: Sure, can you share me your travelling dates? 
 customer: I will be leaving on Oct 25 and will come back on Oct 27. 
 agent: Do you have any connection limit? 
 customer: I need 1 stop over within my route. 
 agent: Is there any other specifications? 
 customer: No. 
 agent: May I know name please. 
 customer: I am Kevin Phillips. 
 agent: I found a flight with the price of 100 having one connection and economy class. Can I proceed to booking? 
 customer: Fine, please proceed. 
 agent: Your ticket is booked with the flight- 1008. 
 customer: Thanks for your support. 
 agent: Thank you for reaching us.
Example Output: book

Example Input: customer: Hello. I am Christine Scott. 
 agent: Hello, how can I aid you today? 
 customer: I would like to book a ticket from ORD to DCA, can you please help me out? 
 agent: Sure, when are you planning to start and return on? 
 customer: I am travelling on these dates AUG 11th and 13th. 
 agent: Do you need a connecting flight or a direct flight? 
 customer: I need a connecting flight. 
 agent: There are no flights found with the given details. 
 customer: Ok no problem, thank you for your services. 
 agent: Thank you, please visit again.
Example Output: no_flight

Example Input: customer: Hello,. 
 agent: Hello, how can I help you today? 
 customer: I am Stephanie Carter. 
 agent: Thanks for providing your name. 
 customer: On 09/09 I am planning to visit jack London square. Can you book my flight ticket from Detroit , MI - DTW? 
 agent: Sure, may I know your destination airport code? 
 customer: My destination airport code Oakland, CA - OAK. 
 agent: Do you need any halt in between journey? 
 customer: I need a halt between my journey. 
 agent: When do you planned your return date? 
 customer: I intend to return on 09/11. Fare of the ticket should be within 500. 
 agent: Ok, please wait a moment, I will check and get back to you. 
 customer: Sure. 
 agent: We are happy to say that there is a flight found with Hawaiian airline of flight number 1003 and fare is 100. Shall I make this reservation for you? 
 customer: Ok, proceed with my reservation. 
 agent: Your ticket has been confirmed with single connection flight. 
 customer: Thank you for assisting me. 
 agent: Thanks for reaching us, have a nice day.
Example Output:
book