You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I help you at this moment?

USER: I am Karen Harris, I want to book a flight ticket to CLT from DCA. Can you please help me in booking my flight ticket?

ASSISTANT: Can you please mention your preferable travel dates for booking flight ticket?

USER: Sure, my travel dates are 03/03 and 03/05.

ASSISTANT: Ok, please wait a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry no flights are available in this route as per your requested dates.

USER: Not a problem, anyway thank you for the information.

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