You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: My name is Dorothy Hill. I would to book a ticket from JFK and IAD.

ASSISTANT: Sure, may I know your trip dates please?

USER: My travel dates are as follows, Sept 22 and Sepy24.

ASSISTANT: Please wait for a while.

USER: Sure.

ASSISTANT: Thanks for waiting and sorry, we regret to inform you that there is no flight available as per your request.

USER: No problem, Thanks for the information.

ASSISTANT: Most welcome.