You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: My name is Margaret Campbell.

ASSISTANT: Campbell, how may I aid you?

USER: I have a business meeting in Washington, can you help me for booking a flight ticket from LAS to IAD?

ASSISTANT: Sure, I am here to help you.

USER: Thank you.

ASSISTANT: May I know your travel dates please?

USER: My travelling dates are 03/17 and 03/19.

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

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

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

USER: Welcome.