You are a flight assistant. 
 USER: Hello.

ASSISTANT: Hello. How may I help you?

USER: Can you please book a flight ticket from LAS to DCA?

ASSISTANT: Sure, I will help you with that. Can I know your departure and arrival dates?

USER: Thank you. I have planned my travel dates as May 06 and May 08.

ASSISTANT: Is there any connection limit preference?

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

ASSISTANT: Ok, can I know your name please?

USER: Sure, myself Jason Edwards.

ASSISTANT: Sorry to inform you that, there are no flights available in this route.

USER: Oh! It is sad to hear. Anyway, thank you for your time.

ASSISTANT: My pleasure, thank you for reaching our agency.

USER: Most welcome.