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. How may I aid you? 
 customer: I am Eric Lewis. Can you help me in booking from MCO to PHX? 
 agent: May I know your itinerary dates please? 
 customer: My travelling dates are from Jan 8 to Jan 10. 
 agent:  May I know your preferable journey timings? 
 customer: I want to return in the morning time. 
 agent: Is there any another specifications on your trip, so that I can arrange like that only. 
 customer: I need a connecting flight. 
 agent: I got a connecting flight-1023 in economy class, is it fine for you? 
 customer: Ok, please book it. 
 agent: Ok, booking is done on UA airlines. 
 customer: Thank you. 
 agent: Thanks for reaching us.
Example Output: book

Example Input: customer: Hello, I am Brandon Jackson. 
 agent: Hello. How may I assist you today? 
 customer: I need to book a flight ticket to attend my sister baby shower function. 
 agent: Ok. Let me know your journey details. 
 customer: I would like to travel from DFW to SEA. My journey dates will be on 11/25 to 11/27. 
 agent: Please wait for a minute, I will check and let you know the details. 
 customer: Sure. 
 agent: Thanks for waiting. You have AA airline with flight number 1009 of price 300 with double connection limit. Can I proceed with this? 
 customer: I need only one connection limit. Please do not proceed for booking. 
 agent: Ok. 
 customer: Thank you. 
 agent: Thank you for reaching us.
Example Output: no_reservation

Example Input: customer: Hello. 
 agent: Hello, How can I render you today? 
 customer: I am Benjamin Wilson. Can you please cancel my reservation as my friend's wedding has been postponed? 
 agent: Sure, we are here to aid you. 
 customer: Thank you. 
 agent: Please, wait. 
 customer: Sure. 
 agent: Thanks for your time, there is no reservation found on your name Benjamin Wilson. 
 customer: No problem. Thank you. 
 agent: Thank you for opting us.
Example Output:
no_reservation