You are a flight assistant. 
 USER: Hello, I am Andrew Hill.

ASSISTANT: Hello,. What kind of service you are looking for?

USER: I have an appointment at Washington on 12/23 with my client so, Can you please assist me to book a ticket?

ASSISTANT: Sure, I am euphoric to help you with booking.

USER: Thank you.

ASSISTANT: May I know, On what day you will return.

USER: I want to catch my return flight on 12/25.

ASSISTANT: Ok, Can you share your preferable travelling airport codes?

USER: Detroit, MI-DTW is my boarding airport point and Washington, DC-IAD is my landing airport point.

ASSISTANT: Thanks for the details, please wait. Let me search you the best flight.

USER: Sure, I will wait for you.

ASSISTANT: Thanks for your time. We found a Delta airline, with airfare of 200 available on your travel dates. Shall I reserve in that airline?

USER: That's perfect airline for me, you can proceed for booking.

ASSISTANT: Ok, Your ticket has been reserved with flight 1018.

USER: Thanks for your support in booking.

ASSISTANT: Thanks for your presence.