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 support you? 
 customer: I am Gregory Parker. 
 agent: Yes, Gregory Parker. 
 customer: I am planning to attend a meeting at independence hall, Can you please book a ticket to Philadelphia, PHL? 
 agent: Sure, please help me with your journey dates. 
 customer: Journey dates are 07/18 to 07/20. 
 agent: May I know your source ciode? 
 customer: Source code is Atlanta, ATL. 
 agent: Ok, please wait a moment. 
 customer: Sure. 
 agent: Are you comfortable with a direct flight? 
 customer: No, I need connecting flight. 
 agent: Sorry, there is no connecting flight on your dates. 
 customer: No problem. Thank you. 
 agent: Thank you for choosing us.
Solution:
no_flight