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

customer: Hello. I am Mark Jones. 
 agent: Hello, how may I assist you today? 
 customer: As my holiday trip has been postponed, I want to cancel my reservation. Can you please help me? 
 agent: Sure, I will help you with cancellation. 
 customer: Thank you. 
 agent: Please wait for a moment, while I search for the reservation on your name. 
 customer: Sure. 
 agent: Thank you for waiting, sorry there is no reservation found on your name. 
 customer: No problem. Thank you. 
 agent: Thank you for visiting us, we hope see you again.
no_reservation