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
Input: customer: Hello. I am Gary Thomas. 
 agent: Hello. How may I assist you? 
 customer: I am looking for a flight from LAS to PHL, can you please help m in booking? 
 agent: Sure, could you please share your planned journey dates please? 
 customer: I am planning to start my journey on Mar 25 and return back on Mar 27. 
 agent: Do you need a connecting flight? 
 customer: Yes, I need a connecting flight. 
 agent: May I know your specific timings of your journey? 
 customer: My arrival time is evening. 
 agent: Do you have any other preferences? 
 customer: No. 
 agent: Gary Thomas, no flights has been found on your planned travel dates. 
 customer: That's ok, thank you for checking. 
 agent: Thank you for reaching us.
Output:
no_flight