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, I am Larry Campbell. 
 agent: Hello, how can I help you? 
 customer: I want to meet my college friend at San Francisco, SFO. 
 agent: Ok. 
 customer: Can you help me in booking with a connecting flight? 
 agent: Sure, we are mirthful to help you. 
 customer: Thank you. 
 agent: Can you please let me know your journey dates? 
 customer: My travelling dates are from 10/23 to 10/25. 
 agent: What is your take off airport code? 
 customer: I am boarding at Boston, BOS. 
 agent: Please wait a minute, I will search a flight for you. 
 customer: Sure. 
 agent: Thanks for your time. 
 customer: Ok. 
 agent: Unfortunately, there are no flights found on your route. 
 customer: Ok, No problem. Thanks for the information. 
 agent: Thank you for choosing us.
Example Output: no_flight

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

Example Input: customer: Hi. 
 agent: Hello, how may I aid you today? 
 customer: Can you find a flight for me from IAH to BOS? 
 agent: Sure, when are you planning to travel? 
 customer: Ok, my journey dates are from Feb 28 to Mar 01. 
 agent: On whose name should I reserve the flight ticket? 
 customer: Sure, I am Matthew Parker. 
 agent: Do you have any specifications to be met? 
 customer: I need a connecting flight. 
 agent: We found a flight in an airline Frontier with 1022 number having a single connection price of 100. Shall I proceed to book? 
 customer: Yes, you can. 
 agent: Your flight ticket has been confirmed. 
 customer: Thanks for your assistance. 
 agent: Thank you for reaching us.
Example Output:
book