You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I am Gary Adams. I need a direct flight, could you please help me with booking a flight ticket?

ASSISTANT: Sure, may I know your nearest airport codes?

USER: Sure, my airport codes are PHL and LAX.

ASSISTANT: Thank you, can you confirm your planned travel dates?

USER: My travelling dates are Sep 16 and Sep 18.

ASSISTANT: Do you have any class preferences on your journey?

USER: Yes, I need a business class.

ASSISTANT: Sure, may I know your name for the documentation purpose?

USER: I have already mentioned above.

ASSISTANT: Do you have any another preferences?

USER: No, I do not have any other preferences.

ASSISTANT: Unfortunately, no flights available on your requirements.

USER: No worries, thank you for the information.

ASSISTANT: Welcome, thank you for reaching us.