You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: Can you please help me to search a flight from Denver, CO-DEN?

ASSISTANT: Sure, may I know your destination airport code please?

USER: The destination airport code is NC-CLT.

ASSISTANT: Please share your travelling dates.

USER: The travelling dates are 03/20 to 03/22.

ASSISTANT: May I know your name please?

USER: Sure, my name is Donna Robinson.

ASSISTANT: Donna, no flights has been found on your journey dates.

USER: Ok, no problem. Thank you for your information.

ASSISTANT: Thank you for approaching us.