You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: Can you please assist me to book a flight ticket from LAS to CLT?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Please let me know with your planned travel dates.

USER: I will takeoff on Dec 21st and will be returning back on Dec 23rd.

ASSISTANT: Thank you. Please help me with the name on which the booking has to be done.

USER: My name is Virginia Roberts.

ASSISTANT: Do you need a direct or connecting flight?

USER: I would like to travel with a direct flight.

ASSISTANT: Please let me know with your preferred airlines to fly.

USER: I am ok to fly in any airline.

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

USER: No.

ASSISTANT: Virginia Roberts, I am really sorry to inform you that there are no flights available that matches your needs.

USER: No problem, thank you.

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