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 can I serve you? 
 customer: Nancy White here. 
 agent: Ok. 
 customer: I want to book a flight to meet my father on the route from DCA - LAX, can you pleas help me? 
 agent: Sure, I will help you. Can you please share your trip dates? 
 customer: I will be travelling on the dates from 01/15 to 10/17. 
 agent: Please standby. 
 customer: Sure. 
 agent: Please re verify your journey dates and let me know. 
 customer: Take your own time. I will be travelling from 01/15 to 01/17. 
 agent: Ok, wait. 
 customer: Ok. 
 agent: There is a direct flight available on your dates. Shall I proceed? 
 customer: No, I want only 1 connection flight for my journey. 
 agent: Sorry, we can provide direct flight only. 
 customer: Ok, no issues. Anyways, thank you for checking for the availability. 
 agent: Thank you for opting us. 
 customer: You are welcome.
Output:
no_reservation