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? 
 customer: I am Betty Williams, help me to book a flight ticket on 08/18 to meet my step father at Philadelphia. Can you book a return ticket on 08/20? 
 agent: Sues, may I know your price limit for this journey? 
 customer: My budget is 5000 for flight ticket. 
 agent: Ok, please provide me your airport codes. 
 customer: I will fly from Orlando, FL-MCO to PA-PHL. 
 agent: Ok, let me check the availability on your route. 
 customer: Sure. 
 agent: Betty, Frontier airline is available with price 100 with single connection. Shall I proceed? 
 customer: Sure. 
 agent: Reservation has been done in 1028 flight. 
 customer: Thank you for helping me with booking. 
 agent: Thank you for opting us.
Example Output: book

Example Input: customer: Hi. 
 agent: Hello, How can I assist you? 
 customer: Book my ticket with the name of Brenda Hall, as there is a Arts and crafts festivals at Charlotte, CLT. 
 agent: Sure, May I know your preferred travel dates? 
 customer: My preferable dates are from 12/12 to 12/14. 
 agent: Do you prefer any connections? 
 customer: Yes, I need. 
 agent: Where do you want to start from? 
 customer: Washington, IAD is my travelling point. 
 agent: Ok, please wait. 
 customer: Sure. 
 agent: We found a flight, with a single connection available for you. 
 customer: Ok. Confirm my ticket. 
 agent: The airline is Southwest, airfare is 100 & Flight number is 1023. 
 customer: Thank you for availing me. 
 agent: Your booking is done. Thanks for your presence.
Example Output: book

Example Input: customer: Hello, Stephanie Carter here. 
 agent: Hello Stephanie, how may I assist you? 
 customer: I want to visit PHL. Can you please book my ticket from EWR? 
 agent: Sure, let me know your travelling dates please. 
 customer: My trip dates are 09/09 and 09/11. Please make sure this flight have minimum 1 connection. 
 agent: I am sorry, there is no flight available with 1 connection. 
 customer: Ok. Thank you. 
 agent: You are welcome.
Example Output:
no_flight