You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello. How can I aid you at this moment?

USER: I would like to meet my father as he is unwell, please book my flight ticket from LAS to DEN.

ASSISTANT: Sure, I am here to help you. Can you please provide your journey dates?

USER: I will depart on Nov 24th and return back on Nov 26th.

ASSISTANT: Do you have any connection limit preference?

USER: Please check for the flight with single connection.

ASSISTANT: Do you have any other specifications for this trip?

USER: No.

ASSISTANT: May I know your name to proceed further?

USER: My name is Benjamin Jackson.

ASSISTANT: Benjamin Jackson, there are no flight services available on this route with your preferable dates.

USER: Sad to hear that. Anyway, thank you for checking.

ASSISTANT: Thank you for contacting us.