You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I aid you?

USER: Could you please find and book a flight ticket from DC-IAD to MI-DTW?

ASSISTANT: Sure, may I know your trip dates?

USER: Sure, 02/18 and 02/20 are my travelling dates.

ASSISTANT: Give me a minute.

USER: Sure.

ASSISTANT: May I know your name?

USER: I am Alexander Moore.

ASSISTANT: Sorry, there is no flight found on your requested dates. Thank you for reaching us.

USER: Thank you for your help.