You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I assist you today?

USER: I am planning to visit Phoenix city, can you please book me a ticket from DCA to PHX?

ASSISTANT: Sure, I can help you with that. Can you please mention your travel dates for booking flight ticket?

USER: My preferable journey dates are from 11/27 to 11/29.

ASSISTANT: May I know your name for further process?

USER: My name is Michelle Smith.

ASSISTANT: Sorry Michelle, no flights available as per your requested dates.

USER: Ok, not an issue. I will find any alternate for this trip.

ASSISTANT: Thank you for reaching us, have a good day.

USER: Thank you for providing information.