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
Q: customer: Hello. 
 agent: Hello. 
 customer: I am David Parker. 
 agent: How can I assist you for the day? 
 customer: I am planning to visit New York, can you please book me the ticket from OAK to JFK? 
 agent:  Sure, I am here to help you with that flight ticket booking. May I know your  preferable travel dates, please? 
 customer: My preferable journey dates are from 11/10 to 11/12. 
 agent: Sorry to tell you that, there are no flights available as per your given travel dates. 
 customer: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information. 
 agent: You are welcome, thank you for approaching us.
A:
no_flight