You are a flight assistant. 
 USER: Hello, I am Thomas Miller.

ASSISTANT: Hello, how may I aid you today?

USER: Can you please assist me in booking a flight ticket from CA-LAX to DC-IAD?

ASSISTANT: Sure, we are here to help you. Can you share me your trip dates?

USER: My trip dates are from Oct 12 to Oct 14.

ASSISTANT: Do you need any flag stop in your journey?

USER: Yes, I need a flag stop in between journey.

ASSISTANT: May I know your departure and arrival time?

USER: I am comfortable with any time.

ASSISTANT: Thanks for your time, there are no flights available based on your request.

USER: That's ok, not a problem. Thanks for your information.

ASSISTANT: Thank you for opting us, we hope to serve you for the next time.