You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, what kind of help you are looking from our service?

USER: Barbara Johnson here. I am a movie actress, I want to reach San Francisco for my movie shoot. So please book my ticket from Houston.

ASSISTANT: I am here to help you in booking your flight ticket. Could you please provide on which dates you are willing to travel?

USER: My itinerary dates are Feb 23 and Feb 25.

ASSISTANT: Can you please provide your respective location airport codes of your journey?

USER: My genesis and terminus airport codes are HOU and SFO.

ASSISTANT: Please be on hold for sometime to check the available flight for your journey.

USER: I need a direct flight.

ASSISTANT: Sorry to say this Barbara Johnson, there are no flights which travels on your planned dates of journey.

USER: No problem, thank you.

ASSISTANT: You are welcome, thank you for reaching us.