You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you today?

USER: Can you please help me in booking a flight ticket from Orlando, MCO to reach Denver, DEN?

ASSISTANT: Sure, may I know your travelling dates?

USER: My travelling dates are from Nov 30 to Dec 02.

ASSISTANT: Is there any specifications?

USER: My return time is evening.

ASSISTANT: Can I know your good name?

USER: My name is Helen Wilson.

ASSISTANT: Sorry, no flights are found on your trip dates.

USER: Ok, that's not a problem. Thank you.

ASSISTANT: Thank you for reaching us.