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: Hi. 
 agent: Hello, how may I assist you? 
 customer: I am heading from Dallas & Fort Worth to meet my manager at San Francisco. Can you help me with the booking? 
 agent: Sure, may I know your airport codes? 
 customer: I intend to start from DFW to reach SFO. 
 agent: Please share me your trip dates. 
 customer: They are on 09/09 and 09/11. 
 agent: May I know your good name? 
 customer: My name is Karen Wright. 
 agent: There is no flight on your details. 
 customer: Ok, thank you for the information. 
 agent: Thank you.
Output:
no_flight