You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello.

USER: Myself Paul Clark.

ASSISTANT: How may I assist you today?

USER: I need to schedule my trip to travel Denver to attend my uncle retirement function. Can you please help me in booking the ticket from HOU to DEN?

ASSISTANT: Sure, I am very happy to help you with that. May I know your travelling dates?

USER: I will take-off 11/15 and again I will return back on 11/17.

ASSISTANT: Just give a moment.

USER: Sure, I will wait for your response.

ASSISTANT: Sorry Paul, no flight are available on your desired route.

USER: Not a big deal, anyhow thank you very much for your service.

ASSISTANT: Thank you for opting us.