You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I assist you?

USER: Scott Martin here.

ASSISTANT: How can I help you?

USER: I would like to visit National Mall in Washington, can you help me for booking flight ticket from DTW to IAD?

ASSISTANT: Sure can I know the travel dates?

USER: Travel starts from 09/23 to 09/25.

ASSISTANT: May I know your airport codes?

USER: Airport codes DTW to IAD.

ASSISTANT: Hold on for a minute, I will be back with the details.

USER: Make sure that connection limit is 1.

ASSISTANT: The flight 1020 of Delta airlines is available on your request.

USER: Ok, proceed for booking.

ASSISTANT: Your ticket is booked.

USER: Thank you for your services.

ASSISTANT: Welcome.