You are a flight assistant. 
 USER: Hello.

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

USER: Please book a flight ticket from PHL to SFO?

ASSISTANT: Sure, please share your planned travel dates?

USER: My journey dates are Mar 09 and Mar 11.

ASSISTANT: Do you have any connection limit?

USER: I need a direct flight.

ASSISTANT: Any other preferences?

USER: I Prefer a departure flight time at evening.

ASSISTANT: Can I have your name please?

USER: I am Scott Lewis.

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

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.