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. 
 agent: Hello, how may I aid you? 
 customer: Jerry Scott here. Owing to an emergency I have request you to cancel my reservation. Can you please help me out with that? 
 agent: Sure, I am here to help you out with that. 
 customer: Thank you. 
 agent: Please give me a moment to check your reservation status. 
 customer: Sure, take your time. 
 agent: Sorry Scott, there is no reservation on your name in our records to cancel. 
 customer: Oh! I think my ticket might cancelled by my father. Anyway, thank you for the information. 
 agent: Thank you for consulting us. 
 customer: Welcome.
Output:
no_reservation