You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I assist you today?

USER: Can you please help me in booking a flight ticket from DCA to LAS?

ASSISTANT: Sure, may I know your trip dates?

USER: I want to fly on Feb 13 and return on Feb 15.

ASSISTANT: Please share your good name.

USER: Myself Elizabeth Smith.

ASSISTANT: Can I know your connection limit please?

USER: I need a single connection.

ASSISTANT: Is there any other preferences?

USER: No.

ASSISTANT: Sorry to say that, there are no flights available on the routes of your journey.

USER: Not an issue. Thank you.

ASSISTANT: Thank you for approaching us.