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

Input: Consider Input: customer: Hello. 
 agent: Hello, what can I do for you at this time? 
 customer:  I am Kimberly Hill. I want to book a ticket to NY-LGA from TX-AUS. 
 agent: Sure, can I know your dates? 
 customer: My travelling dates are 09/23 and 09/25. 
 agent: Just hold on for a moment. 
 customer: Ok. 
 agent: Sorry for the inconvenience, there is no flight available on your dates. 
 customer: Ok, thank you for you response. 
 agent: Thank you for opting us.

Output: no_flight


Input: Consider Input: customer: Hello, I am Raymond Rodriguez. 
 agent: Hello, how can I help you today? 
 customer: I would like to visit overview of city. can you please help me to book a ticket from DCA to MSP? 
 agent: Sure, when are you willing to travel? 
 customer: My travelling dates will be on 09/19 to 09/21. 
 agent: Ok, any other specifications? 
 customer: I need a connecting flight. 
 agent: Ok, flight- 1026, airline- UA, price- 100 with connection matches your requested details. 
 customer: You can proceed to booking. 
 agent: Ok, your ticket has been processed. Thank you for reaching us. 
 customer: Thank you.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello, how may I assist you? 
 customer: will you please book me a direct flight to CLT? 
 agent: May I know your source airport code? 
 customer: I will be leaving from SEA. 
 agent: May I know your travelling dates? 
 customer: My departure is on May 4th and arrival is on May 6th. 
 agent: Is there any connection limit? 
 customer: I have already mentioned above that I need a direct flight. 
 agent: Sorry, Is there any other preferences? 
 customer: No. 
 agent: May I know your good name? 
 customer: I am Gary Taylor. 
 agent: There were no flights found with your required dates to travel. 
 customer: That's alright, thanks for your response. 
 agent: Thank you for choosing us.
Output: no_flight