You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Mark White.

ASSISTANT: Mark White, how may I assist you today?

USER: I want to book a flight from LAX to HOU, can you help me to book a flight ticket?

ASSISTANT: Sure, I will help you. Please help me with your planned travel dates.

USER: My preferable journey dates are Mar 11 and Mar 13.

ASSISTANT: Please help me with your depart and arrival time.

USER: I would like to return back in the afternoon.

ASSISTANT: Do you need a direct or connecting flight?

USER: I prefer connecting flight.

ASSISTANT: Do you have any other preferences in your journey?

USER: No, thanks for asking.

ASSISTANT: Mark White, I am really sorry to inform you that there in no flight available for your journey.

USER: No problem, thank you for the information.

ASSISTANT: Thank you for reaching us. Have a great time.