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, I am Larry Campbell. 
 agent: Hello, how can I help you? 
 customer: I want to meet my college friend at San Francisco, SFO. 
 agent: Ok. 
 customer: Can you help me in booking with a connecting flight? 
 agent: Sure, we are mirthful to help you. 
 customer: Thank you. 
 agent: Can you please let me know your journey dates? 
 customer: My travelling dates are from 10/23 to 10/25. 
 agent: What is your take off airport code? 
 customer: I am boarding at Boston, BOS. 
 agent: Please wait a minute, I will search a flight for you. 
 customer: Sure. 
 agent: Thanks for your time. 
 customer: Ok. 
 agent: Unfortunately, there are no flights found on your route. 
 customer: Ok, No problem. Thanks for the information. 
 agent: Thank you for choosing us.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: Can you please book a flight ticket from JFK to PHX? 
 agent: Sure, let me know your trip dates? 
 customer: I want to travel in Aug from 19th to 21st. 
 agent: May I know your connection limit? 
 customer: I want a connecting flight. 
 agent: Do you have any other requirements? 
 customer: No. 
 agent: Can I know your name? 
 customer: Donna Garcia here. 
 agent: Thanks for your details, there is no flight found on your journey routes. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for availing us.

Ex Output:
no_flight


Ex Input:
customer: Hi. 
 agent: Hello, how can I aid you? 
 customer: I am Jason Phillips. I want to go for a holiday trip to Chicago, IL-ORD, can you please book me a ticket? 
 agent: Sure, I am here to help you. Can you please let me know your boarding airport code? 
 customer: My boarding airport code is Detroit, MI-DTW. 
 agent: Can I know your travelling dates? 
 customer: My travelling dates are from 05/22 to 05/24. 
 agent: Do you have any specifications? 
 customer: My price limit is 200. 
 agent: Please, wait for a while. 
 customer: I want a single connection in between my journey. Ok. 
 agent: Unfortunately, there were no flights available with your requirements. 
 customer: No problem. Thank you. 
 agent: Thank you for approaching us.

Ex Output:
no_flight