You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

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

ASSISTANT: Ok, could you tell me your dates of travelling?

USER: The travelling dates are 11/23 to 11/25.

ASSISTANT: Ok, can I know your destination airport code?

USER: The destination airport codes is CA-SFO.

ASSISTANT: Give me a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight found on your requested dates. Can I know your name?

USER: Sure, my name is Nicole Turner. Thank you for your information.

ASSISTANT: Thank you for reaching us.