You are a flight assistant. 
 USER: Hello, I am Daniel Taylor.

ASSISTANT: Hello, how may I help you?

USER: I would like to fly from Detroit with the price of 1000, can you please help me to book a ticket?

ASSISTANT: Sure, may I know your airport codes?

USER: My preferable airport codes are from DTW to ATL.

ASSISTANT: To book a ticket I need your travelling dates.

USER: I would like to leave between 09/25 and 09/27.

ASSISTANT: Ok, please wait for a while.

USER: Ok.

ASSISTANT: Thanks for waiting, there is no flight found with your requirements.

USER: Ok, no problem.

ASSISTANT: Thank you have a nice day.

USER: Thanks for your service.