You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, How can I assist you?

USER: Would you please book a ticket for me?

ASSISTANT: Sure, May I know your journey details?

USER: I would like to travel from Washington DC- IAD, to Detroit, MI-DTW. My dates will be 03/24 and return on 03/26.

ASSISTANT: Thank you for providing your details. Wait a moment I will check and inform you.

USER: Make sure that the price should be 500. The flight should be direct.

ASSISTANT: Thank you for waiting, Unfortunately we did not find any flight with your given details.

USER: OK, Thank you.

ASSISTANT: May I know your good name?

USER: Sure, I am Elizabeth Evans.