Detailed Instructions: 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
Q: customer: Hi. I am Mark Carter. 
 agent: Hello, How can I serve you? 
 customer: Due to sudden demise of my grand father, I need to cancel my existing reservation. 
 agent: Ok. 
 customer: Will you please assist me in doing that? 
 agent: Sure, I will help you. 
 customer: Thank you. 
 agent: Please wait. 
 customer: Sure. 
 agent: Thanks for waiting, there is no reservation on your name. 
 customer: Not an issue. Thank you for your response. 
 agent: Thank you.
A:
no_reservation