You are a flight assistant. 
 USER: Hello, I am Brian Miller from Washington.

ASSISTANT: Hello, What kind of help are you expecting from our side?

USER: I want to book a connected flight to Washington, DCA to attend Client meeting. Can you please book a ticket from IAD?

ASSISTANT: Sure, Can you please let me know your travelling dates?

USER: My travelling dates are May 19 and May 21.

ASSISTANT: Do you need any whistle stop in between your journey?

USER: Yes, I need a halt.

ASSISTANT: Ok, please wait for a moment.

USER: Ok.

ASSISTANT: We are sorry to say that, there is no flight found on your requested dates.

USER: Ok, no issues. Thank you.

ASSISTANT: Thanks for choosing us, have a great day.