You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I guide you for today?

USER: I am planning to visit Washington, can you please book me a ticket with direct flight?

ASSISTANT: Can you please share on what dates you are willing to travel?

USER: My preferable journey dates are from 02/24 to 02/26.

ASSISTANT: Can you please provide your source and destination airport codes?

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

ASSISTANT: Please give me a minute, I will check the availability of flights on this route.

USER: Sure, take your own time.

ASSISTANT: Sorry, there is no flight available on your requested dates.

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

ASSISTANT: May I know your name?

USER: My name is Benjamin Phillips. Thank you for providing information.

ASSISTANT: Thank you for contacting us, have a nice day.