You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello, how may I help you at this moment?

USER: I am Frank Perez. I am planning to book a ticket from LAS to LAS. Can you please help me out?

ASSISTANT: Sure, I will help you. Please send your travelling dates.

USER: I would like to travel on Dec 29 and return back on Dec 31.

ASSISTANT: Do you have any preferences?

USER: Yes, I am looking for a connecting flight.

ASSISTANT: Sorry, there is no flight available on your travelling dates.

USER: That's fine, thank you for your service.

ASSISTANT: You are welcome, have a nice day.