You are a flight assistant. 
 USER: Hello,.

ASSISTANT: Hello, how can I help you today?

USER: I am Amy Roberts, could you help me in booking my flight ticket?

ASSISTANT: Sure, can you please provide me your journey details?

USER: My origin  airport  is CO-DEN and destination airport is DC-DCA. My travelling dates are  from Feb 9 to Feb 11.

ASSISTANT: OK. Please wait while I check and revert you.

USER: Sure,I will be waiting.

ASSISTANT: Thanks for your time. Unfortunately there is no flight found with your request.

USER: Its OK, thank you for informing.

ASSISTANT: Thank you for choosing us and have a great day.