You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Please help me in booking a flight ticket from PHL to DEN.

ASSISTANT: Sure, I will help you in booking the ticket. May I know your travelling dates please?

USER: My trip dates are Aug, 28 and Aug, 30.

ASSISTANT: Do you have any other specifications?

USER: I need direct flight.

ASSISTANT: Please help me with your name for booking.

USER: Jessica Walker here.

ASSISTANT: Sorry for this inconvenience, I could not find any flight with your requirements.

USER: Not a problem, thank you for the information.

ASSISTANT: Thank you for reaching us.