You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christine Evans.

ASSISTANT: How may I assist you?

USER: I am looking for a flight from DCA to DEN, can you please help me out?

ASSISTANT: Yes, I can help you. Can you tell me your dates of travel?

USER: I am planning to start my journey on 07/01 and return back on 07/03.

ASSISTANT: Give me a moment.

USER: Ok, take your time.

ASSISTANT: Sorry to inform you that there are no flights found on your requested dates.

USER: That's ok, I will choose any other way to reach my destination on time. Anyway thank you for your information.

ASSISTANT: Thank you for contacting our agency.