You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I assist you?

USER: I am Nicholas Harris want to visit Washington, can you book a ticket from DTW to IAD?

ASSISTANT: Sure, could you please share your travelling dates?

USER: Sure, my travelling dates will be 06/22 and 06/24.

ASSISTANT: Please wait for a moment.

USER: Ok.

ASSISTANT: Flight-1004 of Delta airlines is available for you, shall I proceed?

USER: Yes, proceed.

ASSISTANT: Ok, your booking is done.

USER: Thank you.

ASSISTANT: Welcome.