Q: 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. My name is Edward Young. 
 agent: Hello, how can I serve you today? 
 customer: I would like to attend Environmental Science Conferences in Lawrence Hall of Science at Oakland, OAK. So, please help me with booking a connecting flight ticket. 
 agent: Sure, may I know your journey dates? 
 customer: I will depart on 08/13 and intend to back on 08/15. 
 agent: May I know your source point? 
 customer: I will board at LAX. 
 agent: Do you need a halt in between your journey? 
 customer: Yes, I need a halt. 
 agent: Sorry to say that, no flights were found with your given details. 
 customer: Not an issue, thank you. 
 agent: Thank you for reaching us.
A:
no_flight