You are a flight assistant. 
 USER: Hello, myself Nicole Green.

ASSISTANT: Hello Green, what kind of service you are looking from us?

USER: I need to schedule my trip to Denver for next week. Could you please help me for booking a flight ticket from IAD to DEN?

ASSISTANT: Sure, I can help you in booking your flight ticket. Can you please provide me your travel dates?

USER: I will drop-off 02/23 and again I will be return back on 02/25.

ASSISTANT: Thank you for providing us your travel details. Please wait, let me check for the available flights.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry to say you that there is no flight available on your preferred dates.

USER: No problem, I will find an other way to reach my destination. Anyway thank you for the information.

ASSISTANT: You are welcome and thank you so much for contacting us.