You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you? Sure, may I know your travelling dates?

USER: I want to attend a meeting from MI-DTW to PA-PHL.Can you please help me for booking the flight ticket? The travelling dates are from 07/15 to 07/17.

ASSISTANT: May I know your name?

USER: Sure, my name is Deborah Miller.

ASSISTANT: Sorry, no flights found on your details.

USER: Ok, It's fine. Thank you for your information.

ASSISTANT: Thank you for approaching us.