You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: Carolyn Turner here.

ASSISTANT: How may I assist you Turner?

USER: I would like to visit Denver Museum of Nature and Science, which is famous in Denver. Can you please help me for booking the flight ticket?

ASSISTANT: Sure, I will help you.

USER: Thank you.

ASSISTANT: Could you please provide your preferable dates that you want to travel?

USER: I would like to fly on 07/15 and return on 07/17.

ASSISTANT: May I know your nearest airport codes for booking?

USER: Sure, my origin airport code is CA-OAK and destination airport code is CO-DEN.

ASSISTANT: Ok Turner, please hold on moment to check the availability of flights and I will revert back to you.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that, there are no flights available with your requested dates of travelling.

USER: So sad for that.

ASSISTANT: Sorry for the inconvenience.

USER: Anyway, thank you for the information.

ASSISTANT: Thank you for approaching us, have a great day.