You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Patricia Thomas.

ASSISTANT: How may I assist you for today?

USER: I have a business of exporting the fishes in Washington, so I have to go to that work place. Can you please help me in booking a flight ticket from Detroit?

ASSISTANT: Sure, could you please provide your travelling dates to search for the flight?

USER: Thank you for your response. I have to move on the dates of 12/21 and 12/23.

ASSISTANT: May I know your preferable airport codes?

USER: The preferable airport codes are DTW and IAD.

ASSISTANT: Please wait for a moment.

USER: Ok, take your time.

ASSISTANT: Flight 1007 from Spirit airlines available for you, shall I proceed?

USER: That's fine, please book the ticket for me.

ASSISTANT: Ok, your booking is done.

USER: Thank you for booking my flight ticket.

ASSISTANT: You are welcome, have a safe journey.