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: Hello. 
 agent: Hello. How may I help you today? 
 customer: Can you please change my existing reservation? 
 agent: Sure, may I know your name for change in the reservation? 
 customer: Sure, I am Sharon Wright. 
 agent: Please wait a moment. 
 customer: Sure. 
 agent: Thank you for waiting. Sorry, there are no active reservations on your name to change. 
 customer: Thank you for your information. 
 agent: Thank you for reaching our service.

Output: no_reservation


Input: Consider Input: customer: Hi. 
 agent: Hello, how may I aid you today? 
 customer: I need to cancel my ticket, can you help me? 
 agent: Sure, may I know your name? 
 customer: I am David Parker. 
 agent: Please wait for couple of minutes. 
 customer: Sure. 
 agent: We found a reservation on your name, shall I proceed to cancel? 
 customer: Yes, cancel it. 
 agent: Your reservation has been cancelled. 
 customer: Thank you for your help. 
 agent: Thank you for reaching us.

Output: cancel


Input: Consider Input: customer: Hello. 
 agent: Hello, do you need any help from us? 
 customer: I am Gregory Thomas, want to cancel my reservation. Can you please help me? 
 agent: Sure, please allow me a moment. 
 customer: Sure. 
 agent: Thank you for waiting. Sorry, there is no reservation with your name in our portal to cancel further. 
 customer: That's fine, thank you. 
 agent: You are welcome.
Output: no_reservation