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: Hi. I am Kathleen Anderson. 
 agent: Hello, how may I aid you today? 
 customer: Can you help me in cancelling my reservation, owing an emergency? 
 agent: Sure, I will help you with that. 
 customer: Ok. 
 agent: Please wait for a minute. 
 customer: Sure. 
 agent: Thank you for waiting, we found a reservation on your name. Shall I cancel it? 
 customer: You can cancel it. 
 agent: Your reservation has been cancelled. 
 customer: Thank you for helping. 
 agent: Thank you for connecting with us.

Output: cancel


Input: Consider Input: customer: Hi. 
 agent: Hello, how can I help you? 
 customer: I am Elizabeth Gonzalez. I am looking for a direct flight from IAH to DTW, please book my flight ticket. 
 agent: May I know your desired travel dates please? 
 customer: Sure, I want to depart on Dec 4th and I have to return back in the afternoon on Dec 6th. 
 agent: Please wait a while. 
 customer: Sure. 
 agent: There is a flight with connection limit 1 and fare 200, shall I proceed for booking? 
 customer: No, I prefer for a direct flight. 
 agent: Sorry to say, there is no flight available on your desired travel dates. 
 customer: Sad to hear that, thank you for checking. 
 agent: Thank you for opting us.

Output: no_flight


Input: Consider Input: customer: Hello. 
 agent: Hello. 
 customer: I am Laura Edwards. 
 agent: How can I assist you today? 
 customer: My business meeting has been postponed, could you please help me with changing my recent reservation? 
 agent: Sure, please allow me a moment to check for the previous reservation in our data base. 
 customer: Sure. 
 agent: I appreciate your patience. Laura, there is no reservation found under your name. 
 customer: That's ok, no issues. Anyways, thank you for the information. 
 agent: You are welcome. Thank you for contacting us.
Output: no_reservation