You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you today?

USER: My name is Sharon Campbell, can you help me to book a flight ticket from LAX to DEN?

ASSISTANT: Sure, I am here to help you. May I know your travel dates please?

USER: Ok, please book for the dates Nov 20 and Nov 22.

ASSISTANT: Ok, hold on for a moment. Let me check the best flight for you.

USER: Ok, please take your time.

ASSISTANT: Sorry Sharon, there are no flights available on your requested dates.

USER: Ok, thank you for providing the information.

ASSISTANT: Welcome, thank you for choosing us. Have a great day.