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: Hi. 
 agent: Hello. 
 customer: I am Steven Williams. 
 agent: How may I assist you? 
 customer: I would like to visit Oakland. Can you help me for booking a flight ticket from LAX to OAK? 
 agent: Sure, I am here to help you out. May I know your travelling dates please? 
 customer: My journey dates are Apr 14 to Apr 16. 
 agent: How much you can afford for airfare? 
 customer: My fare is 5000. 
 agent: Steven Williams, there are no flights available in your route. 
 customer: No issue, thank you. 
 agent: Thank you for reaching us.
A:
no_flight