You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Margaret wright.

ASSISTANT: How can I help you today?

USER: I have a plan to visit Charlotte, can you help me for booking a flight ticket from DEN to CLT?

ASSISTANT: Sure, I am here to help you in booking. Could you please tell me your travel dates?

USER: I would like to start my journey 12/19 and my return will be on 12/21.

ASSISTANT: Please hold on for a while.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry, no flights are available on your route.

USER: That's ok, thank you for checking.

ASSISTANT: Thank you for reaching us, have a nice day.

USER: Welcome.