You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How can I render you today?

USER: I am Shirley Evans.

ASSISTANT: Ok.

USER: I need a direct flight to attend a client meeting in Seattle, so please book a flight ticket from Detroit.

ASSISTANT: Sure Shirley Evans, I will help you in doing that.

USER: Thank you.

ASSISTANT: May I know your travelling dates?

USER: My departure day is 12/06, return day is 12/08.

ASSISTANT: Could you please share your travelling airport codes?

USER: My source and destination airport codes are MI - DTW, WA - SEA.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry, no flights found on your requested travelling dates.

USER: Ok, no problem. Thank you.

ASSISTANT: Thank you for approaching us, have a nice day.