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 want to attend mechanical workshop, can you please book the ticket from DCA to LAX? 
 agent: Sure, we are perky to assist you. Can you please let me know your travelling dates? 
 customer: Sure, my planned departure and return travel dates are 1st and 3rd of July. 
 agent: Is there any connection limit for you? 
 customer: I don't have any specifications, I'm ok with any flight. 
 agent: May I know your good name? 
 customer: My name is Jeffrey Martin. 
 agent: Sorry, we are unable to provide flights on your journey routes. 
 customer: Oh! That's ok, thank you for giving the information anyways. 
 agent: Thank you for contacting us.
Example Output: no_flight

Example Input: customer: Hello, I am Ryan Anderson. 
 agent: Hello, how may I aid you at this moment? 
 customer: I would like to go to a beach in Washington, so could you please book a ticket for me? 
 agent: Can I have your journey dates? 
 customer: I would like to go on 02/03 and return back on 02/05. 
 agent: Please send your nearby airport codes. 
 customer: My airport codes are PHX and DCA. 
 agent: Please wait for a moment. 
 customer: Ok, ensure it is a single connecting flight. 
 agent: Sorry, no flights are running on those dates. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for reaching us. 
 customer: Welcome.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hi. How can I help you? 
 customer: I am Robert Clark. I would like to reach Washington DC on a vacation trip, so can you please book a flight ticket? 
 agent: Sure, may I know your travel codes please? 
 customer: Airport codes are IAH and IAD. 
 agent: May I know your date of travelling please? 
 customer: My trip dates are 06/24 and 06/26. Please check connection as 1 with price 200. 
 agent: Hawaiian airlines is matching your request with 1025 flight number. 
 customer: Ok, please proceed with booking. 
 agent: Can I book the flight ticket for you? 
 customer: Ok. 
 agent: Your ticket was confirmed. 
 customer: Thank you for booking. 
 agent: Thank you have a safe journey.
Example Output:
book