You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Christopher Roberts.

ASSISTANT: What help that I can do for you right now?

USER: Can you please help me  in checking the flight from DEN to PHL?

ASSISTANT: Sure, I am happy to help you in flight ticket booking.

USER: Thank you.

ASSISTANT: May I know your journey dates?

USER: I have planned my journey dates as 02/09 and 02/11.

ASSISTANT: Please wait a minute.

USER: Ok, I am willing to travel in a direct flight. So, please provide me the best flight.

ASSISTANT: Sorry, there are no flights that are moving on your journey dates to book the ticket.

USER: It's ok, not a problem with that. Anyways thank you for spending your time.

ASSISTANT: It's my pleasure and thank you for approaching us.