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, how may I help you? 
 customer: Myself Mark Brown here. I  need to fly Las Vegas for my college admission, could you please help me in booking my flight ticket from ATL to LAS? 
 agent: Sure, can you please let me know your journey dates that you wish to travel? 
 customer: My travel dates are 11/11 and 11/13. 
 agent: Do you need a flag stop in between your journey? 
 customer: I need a connecting flight. 
 agent: May I know how much do you want to spend on flight ticket? 
 customer:  I can spend upto 500. 
 agent: Please wait for a while. 
 customer: OK. 
 agent: We found a flight in Southwest airlines, flight number is 1005 with one connection price is 100. Shall I proceed? 
 customer: Ok, you can proceed. 
 agent: Ok, your ticket has been confirmed in economy class. 
 customer:  Thank you for booking. 
 agent: Thank you for opting us.

Output: book


Input: Consider Input: customer: Hello. 
 agent: Hello, how can I help you today? 
 customer: Can you find me a direct flight to Washington? 
 agent: Sure, I am here to help you. 
 customer: Thank you. 
 agent: Kindly, share your selected airport codes. 
 customer: My source point is OAK and destination is IAD. 
 agent: May I know that when you have planned to travel? 
 customer: I will fly on Sept 08 and return on Sept 10. 
 agent: Do you prefer a connection limit? 
 customer: I prefer a direct flight. 
 agent: Is there any other concerns to say? 
 customer: No. 
 agent: On whose name, you want to reserve the ticket? 
 customer: My name is Virginia Phillips. 
 agent: Ok, please wait for a few minutes. 
 customer: Sure. 
 agent: Sorry to say that, no flights are found based on your given information. 
 customer: Ok, thank you for the information. 
 agent: Thank you for choosing us.

Output: no_flight


Input: Consider Input: customer: Hi. 
 agent: Hello, how can I help you today? 
 customer: I am willing to book a flight from MCO to reach PHX, can you please help me in booking? 
 agent: Sure, let me know your travelling dates? 
 customer: My travelling dates are on Feb 1st to 3rd. 
 agent: Do you have any connection limit? 
 customer: Yes, I prefer a connected flight. 
 agent: Is there any other preferences? 
 customer: I would like to return in morning time. 
 agent: May I know your good name? 
 customer: My name is Virginia Taylor. 
 agent: Thanks for your details, there is no flight found on your desired journey routes. 
 customer: No issues, thank you. 
 agent: Thank you for availing us.
Output: no_flight