You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I aid you today?

USER: I need to attend business meeting with my clients at PHL, can you please help me to book a flight ticket from SFO?

ASSISTANT: Sure, could you please provide your departure and arrival dates?

USER: Sure, my journey dates are July 23 and July 25.

ASSISTANT: Are you looking for any preferred connections?

USER: I need a direct flight.

ASSISTANT: Do you have any other specifications to be met?

USER: No.

ASSISTANT: Can I have your name to proceed further?

USER: My name is Emily Carter.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Thank you for your valuable time, unfortunately no flights available on that route.

USER: No problem, thank you for your information.

ASSISTANT: Thank you for opting us.