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: Please book a flight ticket on a connecting flight. 
 agent: Sure, I am here to help you. Can you please share your airport codes? 
 customer: My airport codes are from OAK to LAS. 
 agent: On which dates you would like to travel? 
 customer: My trip dates are 09/22 and 09/24. 
 agent: May I know your departure and arrival time? 
 customer: I am comfortable with any timings. 
 agent: Do you have any other requirements? 
 customer: No, thanks for asking. 
 agent: Ok, please share your name. 
 customer: I am Thomas Scott. 
 agent: Sorry, there are no flights in this route as per your travelling details. 
 customer: That's ok, thank you for your information. 
 agent: Thank you for choosing us.
Output:
no_flight