Detailed Instructions: 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
Problem:customer: Hello. 
 agent: Hello. How can I assist you? 
 customer: I would like to visit zoo at Los Angeles. Can you help me? 
 agent: Sure, can I know your travel dates? 
 customer: Sure, the journey dates are 09/13 and 09/15. 
 agent: Can I know your airport codes? 
 customer: I am planning my journey from DCA to LAX. 
 agent: Can I know your name? 
 customer: My name is Gregory Hall. 
 agent: There is no flight available on your requested dates. 
 customer: That's fine, thank you for the information. 
 agent: You are welcome.
Solution:
no_flight