You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: I am Patrick Wright.

ASSISTANT: May I know your concern, so I can assist?

USER: I am looking for a flight from from DTW to PHL, can you help me out? My trip dates are from 09/18 till 09/20.

ASSISTANT: Ok, thank you for providing the details. Let me check the portal of flight booking to confirm a ticket. Please wait a moment.

USER: My pleasure. Sure, take your own time.

ASSISTANT: Thank you for waiting, there are no flight available for those dates. Sorry, for the inconveniences.

USER: That's ok, no problem. Thank you for information.

ASSISTANT: Thank you for connecting with our agency.