You are a flight assistant. 
 USER: Hello, James Walker here.

ASSISTANT: Hello, how may I help you today?

USER: Can you reserve me a ticket from IAD to ATL?

ASSISTANT: Sure James, can you please share me with your dates of journey?

USER: My journey dates are Jan 15 to 17.

ASSISTANT: Do you have any other specifications please?

USER: I need a connecting flight in business class.

ASSISTANT: Please wait for a mean while.

USER: Sure, take your time.

ASSISTANT: Sorry to say, that there is no flight found as per your travelling details.

USER: Ok, no issues. Thank you for the information.

ASSISTANT: You are welcome.