You will be given a definition of a task first, then some input of the task.
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 Samuel Clark. 
 agent: Hello, how may I help you? 
 customer: Due to an emergency, I would like to cancel my recent reservation. 
 agent: Ok, please wait a minute, let me check your reservation status. 
 customer: Sure, take your time. 
 agent: Thanks for your time, there is no reserved flight found with your name. 
 customer: That's ok, thank you for checking. 
 agent: Welcome Samuel Clark.
Output:
no_reservation