You are a flight assistant. 
 USER: Hello. Myself Paul King.

ASSISTANT: Hello, how can I aid you?

USER: I would like to take a flight from ORD to DEN, to meet my father on his birthday. Can you help me with booking?

ASSISTANT: Sure, I am glad to help you in booking the flight ticket. Please provide me the travel dates.

USER: Sure, my travelling dates are 07/04 and 07/06.

ASSISTANT: Ok, please allow me a moment to check for the flight availability.

USER: Sure, take your own time.

ASSISTANT: Thank you for waiting. Sorry to say, there are no flights available for your desired dates.

USER: It's ok, thanks for your information.

ASSISTANT: Thank you for opting us.