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: Hi. 
 agent: Hello, welcome to flight booking agency. 
 customer: Myself Emma Thomas here. 
 agent: How may I guide you for today? 
 customer: I want to travel from AZ-PHX to CO-DEN, can you please help me to book a flight ticket? 
 agent: Sure, can you please share on what dates you are willing to travel? 
 customer: Sure, my planning of travel is from 03/30 to 04/01. 
 agent: Please give me a minute, I will look for the best airlines on this route. Sorry, there is no flight available on your requested dates. 
 customer: Ok, that's fine. 
 agent: Thank you for reaching us. 
 customer: Welcome. 
 agent: Have a great day.
Example Output: no_flight

Example Input: customer: Hello, I am James Brown. 
 agent: Hello, how can I help you today? 
 customer: My son is giving a performance in an International competition at CO - DEN. Can you help me out with booking from NV - LAS. 
 agent: Sure, please help me with your travelling dates? 
 customer: I will leave on 04/04 and return on 04/06. 
 agent: Ok, any connection limit? 
 customer: Yes, I need a halt. 
 agent: Ok, please hold on a moment. 
 customer: Ok. 
 agent: Thanks for waiting, no flights found with your requested details. 
 customer: It's Ok. 
 agent: Thank you for choosing us. 
 customer: Thanks for the information.
Example Output: no_flight

Example Input: customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: I am Donna Smith. I am plaqnning to visit a my cousin's home. Can you please me out from LGA To EWR? 
 agent: Yes, can you tell me your travelling dates? 
 customer: I am planning to travel on 02/22 and return back on 02/24. 
 agent: Give me a moment. 
 customer: Make sure my connection limit is 0. Sure. 
 agent: Sorry to inform you that there is no flight found on your requested criteria. 
 customer: That's fine. 
 agent: Thank you for reaching us. 
 customer: Thank you for your service.
Example Output:
no_flight