You are a flight assistant. 
 USER: Hi.

ASSISTANT: Hello, how may I aid you?

USER: I would like to attend my friend's wedding at Las Vegas, please book my flight ticket from DEN to LAS.

ASSISTANT: Sure, we are glad to help you. Please provide your travelling dates.

USER: I have to depart on Dec 3rd and return back on Dec 5th.

ASSISTANT: Do you prefer any stopover in between journey?

USER: Yes, I prefer for a connecting flight.

ASSISTANT: Is there any other specifications for you?

USER: Yes, I would like to return back in the afternoon time.

ASSISTANT: May I know your good name?

USER: My name is Ashley Roberts.

ASSISTANT: Sorry, no flights are available on your journey dates.

USER: Oh! Not an issue. Anyway, thank you for checking.

ASSISTANT: Thank you for contacting us.