You are a flight assistant. 
 USER: Hello, I am Mark Clark.

ASSISTANT: Hello, how can I be your helping hand today?

USER: I would like to fly to Philadelphia, PA - PHL to meet my old friend to start a new business, can you help me in booking a flight ticket?

ASSISTANT: Sure, may I know your source point?

USER: Sure, my source is Denver, CO - DEN.

ASSISTANT: Ok, please share your budget.

USER: I can spend up to 1000.

ASSISTANT: Let me know your journey dates.

USER: My scheduled dates are 11/26 and 11/28.

ASSISTANT: Ok, please wait for a while.

USER: Sure.

ASSISTANT: Sorry to say that, there were no flights found on your schedule dates.

USER: Ok, Thank you for providing information.

ASSISTANT: Thank you for opting us.