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 Brian Smith. 
 agent: Hello, how can I help you? 
 customer: I have a planned a trip to travel America to see the Golden Gate Bridge, but, on an urgent in my office work, I need to cancel the ticket. Will you please help me with that? 
 agent: Sure, just hold on. 
 customer: Ok, take your time. 
 agent: Sorry to inform you, there is no reservation with your name in our database. 
 customer: It's ok fine. Thank you for your information. 
 agent: My pleasure.
no_reservation