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 may I assist you today? 
 customer: Can you reserve me a ticket from OAK to MSP? 
 agent: Sure, may I know your planned travel dates? 
 customer: My trip dates are Feb 17 to 19. 
 agent: Do you have any limits on number of connections? 
 customer: I need a connecting flight. 
 agent: Do you have any another specifications on your journey? 
 customer: No. 
 agent: may I know your name for the booking process? 
 customer: Brian Perez here. 
 agent: Sorry, no flights are available on your requirement dates. 
 customer: Ok, no issues. Thank you for the information. 
 agent: Welcome, thank you for reaching us.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hello. How can I aid you today? 
 customer: I need to book a connecting flight with the normal-cost airlines. Can you help me with that? 
 agent: Sure, I am here to help you with that flight ticket booking. May I know your travelling dates? 
 customer: Thank you for considering my request. My travelling dates are June 27 and June 29. 
 agent: May I know your name please? 
 customer: My name is Deborah Adams. 
 agent: Is there any airline preference? 
 customer: I have mentioned you already. 
 agent: May I know your preferable airport codes, please? 
 customer: Sure, my airport codes are HOU and PHL. 
 agent: Do you have any other specifications? 
 customer: No. 
 agent: Please wait for a whils. 
 customer: Sure. 
 agent: There are no flights on this route as per your details. 
 customer: Not a problem, anyways thank you for the information. 
 agent: Thank you for reaching us, have a great day.
Example Output: no_flight

Example Input: customer: Hi. I am Jonathan Johnson. 
 agent: Please let me know, how can I support you today? 
 customer:  I want to cancel my recent  reservation due to sudden cancellation of my trip. Can you help me. 
 agent: Sure, we are happy to help to you. 
 customer: Thank you. 
 agent: Please stay online. 
 customer: Ok. 
 agent: Sorry to say that, there is no active reservation found on your name. 
 customer: That's Fine. Thank you. 
 agent: Thank you for communicating with us.
Example Output:
no_reservation