You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I serve you today?

USER: I am Kevin Anderson, I want to book a ticket from Washington, DCA to IAD, can you book a ticket?

ASSISTANT: Sure, I can help you. May I know your planned dates of journey?

USER: I have planned to travel on 08/02 and 08/04.

ASSISTANT: Please wait a minute.

USER: Sure.

ASSISTANT: Thanks for waiting, there are no flights available on your desired locations.

USER: Ok, not a problem.

ASSISTANT: Thanks for approaching us, have a nice day.

USER: Thank you.