You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello,. How can I help you today?

USER: I want to travel in a direct flight. Could you please help me with booking a flight ticket?

ASSISTANT: Sure, can I have your name please?

USER: I am Gregory Phillips.

ASSISTANT: Let me know your airport codes?

USER: My source airport code is IAH and departure airport code is PHL.

ASSISTANT: Please share your planned travel dates? .

USER: Sure, my travelling dates are Aug 1 and Aug 3.

ASSISTANT: Any other preferences?

USER: Yes, I prefer to travel in a business class.

ASSISTANT: Sorry, no flights found with your given details.

USER: No worries, thank you for the information.

ASSISTANT: Thank you for opting us.