You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello.

USER: I am Pamela Moore.

ASSISTANT: How may I aid you today?

USER: Could you help me in booking a flight ticket from DEN to LAS?

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

USER: I want to fly on Jan 26, return on Jan 28.

ASSISTANT: Do you have any other specifications?

USER: I want to depart on the evening. And I need a flight with one connection.

ASSISTANT: Ok, do you have any other requirements?

USER: No.

ASSISTANT: Sorry to say that, there are no flight's found based on your travelling dates.

USER: No problem, thank you.

ASSISTANT: Thank you for approaching us.