You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, what kind of help you  are looking for?

USER: I want to book a flight ticket from PHL to DCA. Can you please help out?

ASSISTANT: Sure, can you please share your journey dates?

USER: My travelling dates are Feb 18 and Feb 20.

ASSISTANT: Do you prefer connecting or direct flight in your journey?

USER: I need direct flight.

ASSISTANT: Is there any class preference?

USER: I prefer business ticket.

ASSISTANT: Do you have any other preferences?

USER: No.

ASSISTANT: May I know your name please?

USER: Myself Emily Lewis.

ASSISTANT: Ok, please wait for a while.

USER: Ok, I will wait.

ASSISTANT: Sorry to inform you that, we did not find any flights matching your journey dates.

USER: Ok, thanks for checking.

ASSISTANT: Thank you for opting us.