You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you today?

USER: I am Jacob Lewis, planning to visit Detroit. Can you please book me a ticket from Washington?

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

USER: My preferable journey dates are from 02/14 to 02/16.

ASSISTANT: Ok, may I know your respective airports codes please?

USER: My nearest airport codes of travelling are from DCA to DTW.

ASSISTANT: Ok, please wait for a mean while.

USER: Sure, take your own time.

ASSISTANT: Sorry Lewis, there is no flight found as per your travelling details.

USER: Ok, not an issue. I will find any alternate for this trip. Thank you for providing information.

ASSISTANT: You are welcome.