You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you?

USER: I want to book a flight ticket from DEN to PHL. Can you find a flight ticket for me?

ASSISTANT: Sure, let me know your travelling dates.

USER: Ok, my planned trip dates are on Dec 07 and return on Dec 09.

ASSISTANT: May I know your connection limit?

USER: I need a single connecting flight.

ASSISTANT: Do you have any other requirements?

USER: I want to return in the afternoon time.

ASSISTANT: May I know your name please?

USER: Ok, my name is Raymond White.

ASSISTANT: Sorry, there are no flights found with your given details.

USER: Ok, not a problem.

ASSISTANT: Thank you for opting us.

USER: Thank you for your help.