You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how can I help you?

USER: I want to fly from LAS to DEN. Can you book a ticket from that route?

ASSISTANT: Sure, I am happy to help you. Can I have your travelling dates?

USER: Sure, my planned travel dates are 09/26. And my return date is 09/28.

ASSISTANT: Do you prefer any stopover in between journey?

USER: I want a flight with single connection.

ASSISTANT: Are there any other specifications for you?

USER: Make sure that my return time should be in the evening only.

ASSISTANT: Can I have your good name?

USER: Sure, Andrew Harris here.

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

USER: No issues, thank you for the information.

ASSISTANT: Thank you for contacting us.