You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I guide you?

USER: I am Betty King. I have to attend a meeting in white house it is in Washington, can you please book a flight ticket from CLT to IAD?

ASSISTANT: Sure, it's a good place to visit. May I know on which dates you would like to travel?

USER: My departure day is 07/19 and return date is 07/21. I want 1 connection limit flight.

ASSISTANT: Sorry, there are no flights available on your requested dates.

USER: It's ok. Thank you for your information.

ASSISTANT: Thank you, have a nice day.