You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you?

USER: Carolyn Young is my name.

ASSISTANT: Ok.

USER: I want to participate in Death Valley Adventure in Washington on 08/10. Can you help me for booking a flight from Denver, DEN?

ASSISTANT: Sure, I will help you. Can I have your destination airport code please?

USER: Sure, my destination airport code is DC - DCA.

ASSISTANT: May I know your travel dates?

USER: Ok, my return date is 08/12.

ASSISTANT: Ok, please wait a moment.

USER: Sure.

ASSISTANT: Sorry to inform you that there is no flight available with your requirements.

USER: Ok, no problem. Thanks for your assistance.

ASSISTANT: Thank you for approaching us.