Q: 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. 
 agent: Hello, what kind of help you are looking for? 
 customer: I want to cancel my recent reservation, can you please help me? 
 agent: Sure, may I know your name please? 
 customer: I reserved my ticket under the name Richard Nelson. 
 agent: Ok, please be on hold for some time. 
 customer: Sure, I will wait. 
 agent: Sorry, we could not find any reservation on your name in our database. 
 customer: No issue, anyway thank you for checking. 
 agent: Thank you for choosing us.
A:
no_reservation