You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

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

ASSISTANT: Sure, can I know the travel dates please?

USER: My preferable journey dates are from 02/09 to 02/11.

ASSISTANT: May I know your name please?

USER: My name is Catherine Walker.

ASSISTANT: Sorry, there are no flights available as per your request.

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

ASSISTANT: Thank you for approaching us.

USER: Thank you for providing infrormation.