Definition: 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: customer: Hi. I am Jonathan Davis. 
 agent: Hello, how can I amend you? 
 customer: Can you reserve me a flight ticket to Charlotte, CLT as I would like to visit The Billy Graham library? 
 agent: Sure. 
 customer: Thank you. 
 agent: Let me know your origin code. 
 customer: Origin code is Boston, BOS. 
 agent: How much you can afford for this journey? 
 customer: I can afford up to 500. 
 agent: Let me know your trip dates to check the flights. 
 customer: 02/12 and 02/14 are my depart and arrival dates. 
 agent: Please, wait. 
 customer: Ok. 
 agent: Thanks for waiting, there is flight with price 800. Shall I Proceed? 
 customer: No, do not proceed. 
 agent: Ok. 
 customer: Thank you for your response. 
 agent: Thank you for choosing us.
Output:
no_reservation