You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I support you today?

USER: Can you please book me a flight ticket from LAS to DEN to meet my family?

ASSISTANT: Sure, please share me your travel dates.

USER: I have planned to travel on Sept 21st and return on Sept 23rd.

ASSISTANT: Do you need direct flight or connecting flight?

USER: I prefer connecting flight.

ASSISTANT: For booking, we need your good name. Please mention it.

USER: Kimberly Davis.

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

USER: Ok, no problem.

ASSISTANT: Thank you for reaching us.

USER: Thank you.