You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you?

USER: I am Christopher Walker. I am a director and I have to shoot a video song in Denver, so I need a flight ticket to reach that location. Can you please help me in flight ticket booking?

ASSISTANT: Sure, we are here to help you.

USER: Thank you for considering my request.

ASSISTANT: Kindly assign me your trip dates?

USER: Sure, I have planned to move in the month of December. So the journey dates would be on Dec 19 and please book the return ticket also in the same month on Dec 21.

ASSISTANT: Sure, we need some more information to proceed further, can you share me your source point?

USER: Sure, I can provide you and the nearest regional airport codes are from SFO to DEN locations.

ASSISTANT: May I know your airline preference?

USER: I don't have any airline preference and you can book the flight in any of the airlines that is obtained based on my details.

ASSISTANT: Would you like to prefer direct flight or connecting flight?

USER: I am looking for a single stop over in between my journey.

ASSISTANT: Please wait for a couple of minutes.

USER: Sure, I can wait for your response.

ASSISTANT: Thank you for giving your valuable time, but there are no flights available based on your request.

USER: It's alright, no problem with that one. I can prefer any other source to reach my destination region. Thank you for your quick help.

ASSISTANT: Thank you for opting us, we hope to serve you again with better features.