You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I aid you today?

USER: Me and my friend are planning to go for shopping in 16th Street Mall at Denver.

ASSISTANT: OK.

USER: Could you please help me in booking a ticket on 09/27?

ASSISTANT: Sure, let me know your airport codes please?

USER: I would like to start from Orlando FL-MCO. MY landing point is Denver CO-DEN.

ASSISTANT: Do you have any specification?

USER: Yes, I need a waystation.

ASSISTANT: When you are return from your journey?

USER: I intend to return on 09/29.

ASSISTANT: May I know your good name please?

USER: I am Brian Davis.

ASSISTANT: OK, thanks for your details, please hold on.

USER: Sure.

ASSISTANT: Thanks for your being patience. Sorry to inform you there is no flights found with your specifications.

USER: No problem. Thank you for your service.

ASSISTANT: Thank you for reaching us, have a good day.